Frequently Asked Questions

Filaflex is a flexible TPU (thermoplastic polyurethane) filament specially designed for 3D printing. Developed by Recreus, Filaflex is characterized by its high elasticity, resistance, and versatility, making it the ideal material for creating flexible and elastic parts with FDM (Fused Deposition Modeling) 3D printers.

We have different Shore hardnesses that adapt to different needs:

• Filaflex 60A 'Pro': Our most elastic and soft version, ideal for applications that require maximum flexibility.
• Filaflex 70A 'Ultra-Soft': Excellent balance between elasticity and ease of printing.
• Filaflex 82A 'Original': Our most versatile and popular filament, suitable for most applications.
• Filaflex 95A 'Medium-Flex': The most rigid version, compatible with any 3D printer, including bowden-type printers.

To understand this, we must be clear about what both concepts mean:

• Flexibility is the mechanical property of a material to bend without breaking, altering its shape after stretching.
• Elasticity is the property of a material to experience reversible deformations.

That is, once the force ceases, the material recovers its original shape without having suffered any deformation. Due to its mechanical properties, Filaflex is an elastic filament, since after stretching, it recovers its original shape without altering its diameter or shape. Therefore, technically it is elastic rather than flexible.

No. The great advantage and property of Filaflex is that, being an elastic material, after stretching and as long as the elastic limit of the material is not exceeded, the filament returns to its original shape without suffering any deformation in its diameter.

Filaflex offers numerous advantages over other TPU filaments available on the market:

• Superior elasticity: Recovers its original shape after being stretched, without permanent deformations.
• Wide range of hardnesses: From 60A to 95A, allowing you to choose the exact elasticity you need.
• Excellent layer adhesion: Provides stronger and more durable parts.
• High chemical resistance: Resistant to solvents, fuels, and many chemicals.
• No heated bed required: Simplifies the printing process and saves energy.
• Wide range of colors: Includes transparent and fluorescent options.
• Manufactured in Spain: With strict quality controls and complying with European regulations.
• Specialized technical support: Backed by years of experience and research in flexible materials.

Filaflex is extremely versatile and can be used in numerous applications:

• Footwear: Soles, orthopedic insoles, complete shoes like our Sneakers model.
• Medicine and orthopedics: Splints, prosthetics, personalized technical aids.
• Industry: Gaskets, seals, shock absorbers, protections.
• Automotive: Flexible parts, functional prototypes.
• Fashion and accessories: Bracelets, watch straps, accessories.
• Toys and leisure: Articulated figures, flexible toys.
• Cases and protections: For electronic devices and other objects.
• Art and design: Sculptures, decorative objects with elastic properties.

The versatility of Filaflex allows you to create practically any object that requires elastic or flexible properties.

It is a scale that measures the elastic hardness of materials based on the elastic reaction of the material when an object is dropped on it. Several scales are used to measure 'shore hardness': Shore A, B, C, D, 0 and 00. The Shore A scale is the most convenient for measuring elastomers. This is how we measure the shore hardness of our Filaflex filament range.

This way, you can determine what hardness each filament range has (60A, 70A, 82A and 95A) and thus know for what applications and/or pieces it may be more convenient to use. The higher the range number (95A), the lower the elasticity and the lower the range (60A), the higher the elasticity. See more information on this topic in this post on 'What is Shore Hardness?'.

The difference lies in the measurement of its elastic hardness or 'Shore hardness', according to a scale that measures it: the Shore 'A' hardness scale. Filaflex 95A being the least elastic filament of all and Filaflex 60A the most elastic and soft of them. You have more information on this topic in this post on 'What is Shore Hardness?'.

Yes, Filaflex is resistant to solvents, acetone, and fuel. This property makes it ideal for applications where the material may be exposed to these chemicals, such as automotive parts, industrial prototypes, or components that require cleaning with solvents.

This chemical resistance is one of the key advantages of TPU materials like Filaflex over other flexible materials used in 3D printing.

Our materials do not contain a UV stabilizer. If you are interested, please contact us.

For outdoor applications or those exposed to direct sunlight, we recommend applying a UV-protective coating after printing, or contacting our technical team for customized solutions.

Filaflex can withstand up to 70ºC and temperatures of -40ºC. This makes it suitable for a wide range of applications, from parts that may be exposed to moderate heat to components that must function in extremely cold conditions.

It is important to consider these temperature limits when designing parts for specific environments, especially in industrial or outdoor applications.

No, Filaflex is not a biodegradable material, but it is recyclable. That is, if you have manufactured a piece completely with Filaflex, you could melt that material again and create a new recycled Filaflex filament. If you are interested in a recycled flexible filament, we recommend our Reciflex filament, a 100% recycled TPU flexible filament.

Reciflex represents our commitment to sustainability and the circular economy, offering the same exceptional mechanical properties that characterize our Filaflex range, but with a lower environmental impact.

A piece printed in Filaflex in transparent color will not be 100% transparent, but its final finish will be translucent. This is due to the nature of the FDM 3D printing process, where multiple layers and printing lines affect the transparency of the material.

To maximize transparency, we recommend printing with thin layers (0.1-0.15mm), reduced speed, and a high infill percentage (90-100%). You can also improve transparency through post-processing, such as gentle polishing or applying transparent coatings.

Any filament in the Filaflex range can be used to print insoles — it all depends on the hardness and functionality you want to achieve. One of the advantages of using Filaflex is that you can print insoles with different performance zones (harder and softer) by adjusting the infill percentage in your slicer, even if you're using a single Shore hardness material. This allows for excellent design flexibility and comfort optimization using just one filament.

That said, here are the most common choices among our customers for orthopedic or sport insoles:

• Filaflex 82A for general purpose insoles with good flexibility and resistance
• Filaflex 70A for greater cushioning and comfort
• Filaflex 60A for areas requiring maximum impact absorption
• Filaflex 95 Foamy, a lightweight, semi-rigid TPU with micro-expanding technology that offers excellent energy return, softness and thermal insulation — ideal for full insoles, midsoles or comfort layers where lightness and bounce are key

As always, we recommend performing your own tests to determine the most suitable option for your specific design and application.

Below are the official dimensions of our Filaflex spools:

• 500g – 750g spools:
  • Outer Diameter (OD): 203 mm
  • Barrel Diameter (BA): 104 mm
  • Inner Hole Diameter (ID): 52.5 mm
  • External Width (EW): 52.5 mm
  • Internal Width (IW): 43 mm
• 2.5 – 3kg spools:
  • Outer Diameter (OD): 300 mm
  • Barrel Diameter (BA): 180 mm
  • Inner Hole Diameter (ID): 52 mm
  • External Width (EW): 103 mm
  • Internal Width (IW): 90.4 mm

Box dimensions (for 3kg spool):
320 mm × 125 mm × 330 mm (Length × Width × Height).

The approximate filament length (in meters) depends on the Filaflex Shore hardness, the spool weight and the filament diameter (1.75 mm or 2.85 mm):

• Filaflex 95A
  • 1.75 mm – 500g: 207.88 m
  • 2.85 mm – 500g: 78.38 m
  • 1.75 mm – 3kg: 1247.26 m
  • 2.85 mm – 3kg: 470.26 m
• Filaflex 82A
  • 1.75 mm – 500g: 185.6 m
  • 2.85 mm – 500g: 69.98 m
  • 1.75 mm – 3kg: 1113.62 m
  • 2.85 mm – 3kg: 419.88 m
• Filaflex 70A
  • 1.75 mm – 500g: 192.48 m
  • 2.85 mm – 500g: 72.57 m
  • 1.75 mm – 3kg: 1154.87 m
  • 2.85 mm – 3kg: 435.43 m
• Filaflex 60A
  • 1.75 mm – 500g: 194.28 m
  • 2.85 mm – 500g: 73.25 m
  • 1.75 mm – 3kg: 1165.66 m
  • 2.85 mm – 3kg: 439.5 m

Note: The lengths shown are approximate and may vary slightly depending on manufacturing tolerances.

We have a declaration of conformity available upon request, which indicates which Filaflex shores and colors use raw materials that comply with European standards and FDA regulations. In addition, our production, storage, preparation and delivery process complies with Good Manufacturing Practices regulations. However, the certification of the final product is a responsibility that must be assumed by the agent that introduces it into the market depending on the transformation process and its specific use.

It is important to note that, although the base materials comply with regulations, the 3D printing process can introduce variables such as porosity or contamination that could affect suitability for food contact. Therefore, we recommend carrying out specific tests for each specific application.

Yes, Filaflex is a material compatible with skin contact at the cutaneous level, it is non-toxic and does not generate odors. Filaflex has been used and continues to be used to create many applications such as textile pieces and accessories, as well as insoles and prostheses that are in contact with the skin. However, it cannot be introduced intracutaneously (inside the skin) and its use on wounds or ulcers is not recommended without carrying out the relevant toxicological tests for the application in question.

On the other hand, we have several skin safety tests that have been carried out for Filaflex and Filaflex Foamy ranges. The tests, based on ISO 10993, are as follows:

• Acute skin irritation test
• Skin sensitization test
• Cytotoxicity

These certifications make Filaflex and Filaflex Foamy especially suitables for medical and orthopedic applications that require prolonged contact with the skin, such as custom insoles, splints, or prostheses.

No, it is non-toxic and does not produce odors. Filaflex has been subjected to rigorous safety tests that confirm its suitability for multiple applications, including those involving contact with the skin.

Our filaments are manufactured with high-quality raw materials and processed in facilities that comply with strict quality and safety standards. This ensures that the final product is safe for use in the recommended applications.

Filaflex complies with various regulations and certifications depending on the type and application:

• Food contact: Raw materials compliant with European and FDA regulations (declaration of conformity available).
• Skin contact: Tests based on ISO 10993 for Filaflex 95A, 82A, 70A and 60A (skin irritation, sensitization, and cytotoxicity).
• Production: Our processes comply with Good Manufacturing Practices regulations.
• REACH: Compliance with the European Regulation concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals.
• RoHS: Compliance with the directive that restricts the use of certain hazardous substances in electrical and electronic equipment.

For specific applications that require additional certifications, we recommend contacting our technical department for detailed and updated information.

Filaflex can be used for certain external medical applications such as splints, orthopedic insoles, external prostheses, and personalized technical aids that do not involve contact with open wounds or introduction inside the body.

For specific medical applications, we recommend:

• Consulting with medical professionals before designing or manufacturing any medical device.
• Verifying local regulations regarding 3D-printed medical devices.
• Contacting our technical department for information on available tests and certifications for the specific application.
• Considering that the final responsibility for the use of the product for medical applications lies with the device manufacturer.

Filaflex is not designed or certified for implants or invasive medical devices.

The extruder is one of the most important parts of any FDM 3D printer. It is the mechanism that pushes the filament towards the hotend to be melted. There are two extrusion systems, the direct system and the indirect or 'bowden' type. More information in this post on 'Direct Extrusion vs. Bowden Type'.

Bowden extrusion consists of removing the motor that pushes the filament from the moving parts and placing it in the structure of the printer. In this way, we have the motor in the structure of the printer, which implies a reduction in weight and inertia in the moving parts. The filament is guided by a tube (bowden) from the extruder to the hotend. More information in this post on 'Direct Extrusion vs. Bowden Type'.

Direct extrusion consists of placing the motor that pushes the filament directly on the hotend, in the moving part of the printer. This system is ideal for extruding flexible filament, since its advantage is that it pushes the filament close to the hotend and is easier to calibrate. In this way, good control of material retractions is achieved to obtain a better finish on the pieces, avoiding jams. In addition, and most importantly, it allows you to easily print our flexible Filaflex filament. More information in this post on 'Direct Extrusion vs. Bowden Type'.

It depends on the Shore hardness of the Filaflex flexible filament you want to print.

• Filaflex 95A 'Medium-Flex': is compatible with any printer and can be printed on both 3D printers with direct extruder and bowden 3D printers. Being a semi-flexible filament, it obtains a better thrust avoiding tangles and jams in the tube that joins the extruder and the hotend.
• Filaflex 82A 'Original': being a more elastic flexible filament, it is somewhat more complicated to print with this type of printer. We will only obtain good results by changing the printer tube for one of PTFE (Teflon), since we get the filament to slide much better. In addition, it is advisable to make sure to eliminate any bends or twists in the tube, trying to keep it as straight as possible to avoid unnecessary friction.
• Filaflex 70A 'Ultra-Soft': cannot be printed on bowden 3D printers. The filament could get stuck in the tube since it is not a rigid material. It would be like 'pushing a rope'. Hence the complexity to print correctly. We recommend using printers with direct extrusion for printing flexible filament or, as mentioned above, changing the printer tube for one of PTFE (Teflon).
• Filaflex 60A 'Pro': cannot be printed on bowden 3D printers either. The filament could get stuck in the tube since it is not a rigid material. It would be like 'pushing a rope'. Hence the complexity to print correctly. We recommend using direct extrusion printers for printing flexible filament.

Yes, but for this you will have to change the printer tube for one of PTFE (Teflon), since the tubes used in Ultimaker printers are made of FPA material. This material has high transparency, but a higher coefficient of friction than PTFE (Teflon). With this change we get the filament to slide much better, allowing you to print filaments with lower 'shore'. In addition, be sure to eliminate any bends or twists in the tube, trying to keep it as straight as possible to avoid unnecessary friction.

No. Filaflex 60A is a very soft filament and is very difficult to print on an Ultimaker printer even if we change the tube for one of PTFE (Teflon). We do not recommend using this filament in this type of bowden printers.

The Prusa i3 MKS3+ printer incorporates an 'All Metal' extruder. In some hotends of this type, as in this case, that do not have a good polished internal surface and also have poor cooling in the barrel area, it is very common to suffer problems of extrusion flow with very flexible materials due to the thermal expansion of the filament and the high adhesion of the same to the internal surface of the barrel caused by internal heat. Therefore, this type of extruder will present friction and filament feeding problems when we want to print with the lowest Shore hardnesses of Filaflex. That is, we can print Filaflex 95A and 82A, but we will have friction and filament feeding problems with the most elastic Filaflex filaments such as Filaflex 70A and 60A.

Based on the comments of our customers and users, we can recommend the following 3D printer models for printing Filaflex flexible filament:

• Printers with direct extruder: Creality (CR-10, Ender 3, Ender 5), Artillery Sidewinder X1/X2, Prusa i3 MK3S (with limitations in speed)
• Bowden extruder printers (with PTFE tube): Ultimaker (with tube modification), Anycubic (some models)
• Specific printers for flexible materials: Recreus F1 (designed specifically for Filaflex)

For more information on printer compatibility, visit our website.

The nozzle is the component of the printer through which the molten filament exits and is placed on the printing plate. There are different types of nozzles that have different sizes (0.2, 0.4, 0.6, ....) and are made of different materials (brass, copper, steel, ...). It is important to know them in order to choose the most suitable one for the material to be printed.

For printing with Filaflex, we recommend 0.4mm or larger nozzles, as smaller diameters can hinder the extrusion of flexible materials.

Sometimes the prints lose quality and this may be because the nozzle of the printer's extruder may be partially blocked by sediments from other filaments. This is a problem that can be avoided and corrected quickly and easily by repairing and cleaning it. It is a process that we recommend carrying out from time to time as a necessary maintenance task to achieve optimal extrusion flow in our prints with flexible filaments. More details and information in this video on 'Maintenance and Repair of the Hotend of your 3D printer'.

Printing parameters may vary depending on your printer model and the specific Filaflex grade (60A, 70A, 82A, 95A, Foamy, SEBS…). To ensure optimal results, we recommend checking our official printing guide, where you’ll find detailed settings for each material:

There are several reasons why Filaflex filament may not extrude correctly:

• Clogged nozzle: Sometimes the prints lose quality because the nozzle of the printer's extruder may be partially blocked by sediments from other filaments. This is a problem that can be avoided and corrected quickly and easily by repairing and cleaning it. It is a process that we recommend carrying out from time to time as a necessary maintenance task to achieve optimal extrusion flow in our prints with flexible filaments.
• Moisture in the filament: Flexible filament has a high capacity to absorb atmospheric humidity. Sometimes the filament may not behave as it should and the finish of the piece may not be as desired. In this case, we may have a humidity problem.
• Too high speed: Flexible filaments require lower printing speeds than rigid filaments. Try reducing the speed to 15-20 mm/s.
• Incorrect temperature: Make sure you are printing within the recommended temperature range (220-235°C).
• Extruder problems: Make sure the extruder tension is suitable for flexible filaments (generally lower than for rigid filaments).

This is a common problem with flexible filaments on printers with a Bowden system. Depending on the Shore hardness of the Filaflex filament, you can find different solutions:

• For Filaflex 95A 'Medium-Flex': It is compatible with any printer and can be printed on both 3D printers with direct extruder and bowden 3D printers. Being a semi-flexible filament, it obtains a better thrust avoiding tangles and jams in the tube that joins the extruder and the hotend.
• For Filaflex 82A 'Original': It can be printed on printers with a Bowden system, but it is recommended to change the standard tube for one of PTFE (Teflon) to reduce friction.
• For Filaflex 70A 'Ultra-Soft' and 60A 'Pro': They cannot be printed on bowden 3D printers. The filament could get stuck in the tube since it is not a rigid material. It would be like 'pushing a rope'. Hence the complexity to print correctly. We recommend using printers with direct extrusion for printing flexible filament.

If you have a Bowden printer and want to print with very flexible filaments, consider upgrading your printer to a direct extrusion system.

If you notice that your spool may have absorbed some moisture, we recommend several methods and solutions to remove it:

• Filament dryer: Devices specifically designed to dry 3D printing filaments.
• Food dehydrator: An economical alternative that works well for drying filaments.
• Conventional oven: The most accessible method that you can put into practice by introducing the filament spool into a conventional oven at 50ºC for 3 hours in fan mode. The oven must be preheated and the spool introduced once the temperature of 50ºC has been reached.

To prevent moisture absorption, store your spools in a dry place, ideally in sealed bags with silica desiccants.

Stringing is common when printing with flexible filaments due to their viscoelastic properties. Here are some solutions to reduce this problem:

• Adjust the temperature: Try reducing the printing temperature in increments of 5°C until you find the optimal point.
• Adjust the retraction: Although it is generally recommended to disable retraction for very flexible filaments, for higher hardnesses (82A, 95A) you can experiment with small retractions (0.5-1mm) at moderate speeds.
• Increase the travel speed: Higher travel speeds can reduce the time the filament has to drip.
• Improve cooling: Make sure your layer fan is working correctly to cool the extruded material quickly.
• Use the "combing" or "avoid crossing perimeters" function: This setting in your slicing software can reduce movements that cross empty spaces.

Remember that it may be necessary to experiment with different combinations of these settings to find the optimal configuration for your specific printer.

Although Filaflex generally has excellent adhesion to the printing bed, problems may arise in some cases. Here are some solutions:

• Bed cleaning: Make sure the printing surface is clean of dust, grease, or residue from previous prints. You can clean it with isopropyl alcohol.
• Bed leveling: Verify that the bed is correctly leveled and that the first layer has the correct height.
• First layer speed: Reduce the printing speed of the first layer to 10-15 mm/s to improve adhesion.
• Bed temperature: Although not strictly necessary, heating the bed to 30-40°C can improve adhesion in some cases.
• Use of adhesives: For parts that exceed a volume of 20x20x20 cm, it is recommended to apply lacquer to ensure good adhesion.

If you continue to have problems, consider using a raft or brim to increase the contact surface with the bed.

The Prusa i3 MKS3+ printer and others with "All Metal" extruders incorporate an extruder of this type. In some hotends of this type, as in this case, that do not have a good polished internal surface and also have poor cooling in the barrel area, it is very common to suffer problems of extrusion flow with very flexible materials due to the thermal expansion of the filament and the high adhesion of the same to the internal surface of the barrel caused by internal heat.

Therefore, this type of extruder will present friction and filament feeding problems when we want to print with the lowest hardnesses or shores of Filaflex. That is, we can print Filaflex 95A and 82A, but we will have friction and filament feeding problems with the most elastic Filaflex filaments such as Filaflex 70A and 60A.

Possible solutions to this problem include:

• Use higher hardness Filaflex filaments: Opt for Filaflex 95A or 82A instead of the more flexible versions.
• Modify the hotend: Consider changing to a hotend with better cooling in the transition area or with a PTFE internal coating.
• Reduce printing speed: Lower speeds can help reduce friction problems.
• Adjust the temperature: Experiment with different temperatures to find the optimal point that minimizes the thermal expansion of the filament.

Filaflex is an extremely versatile filament that can be used in a wide variety of applications thanks to its flexible and elastic properties. Some of the most common applications include:

• Orthopedic insoles: Customized for each user, taking advantage of different filling densities to create zones with different properties.
• Prostheses and orthoses: Flexible components for medical and assistive devices.
• Textile accessories: Flexible pieces that can be integrated into garments and accessories.
• Cases and protectors: For electronic devices, tools, and other objects that require protection against impacts.
• Toys and articulated figures: Taking advantage of flexibility to create mobile and resistant parts.
• Gaskets and seals: For industrial applications that require resistance to fluids and hermetic sealing.
• Automotive components: Flexible parts for the interior of vehicles.
• Customized footwear: Soles, decorative and functional elements for shoes.

The versatility of Filaflex allows you to create practically any object that requires elastic or flexible properties.

The choice of Shore hardness will depend on the specific use you are going to give your printed parts. Here is a general guide:

• Filaflex 60A 'Pro': The most flexible and elastic version, ideal for applications that require maximum elasticity such as sealing gaskets, elastic bands, shock absorption elements and parts that need to be stretched considerably.
• Filaflex 70A 'Ultra-Soft': Excellent for applications that require a good balance between elasticity and ease of printing.
• Filaflex 82A 'Original': Offers a good balance between flexibility and rigidity, suitable for functional parts such as ergonomic grips, wheels, shoe soles, and industrial applications that require some flexibility but also structural resistance.
• Filaflex 95A 'Medium-Flex': The most rigid version, ideal for parts that require greater dimensional stability but with some flexibility, such as live hinges, flexible mechanical components, and parts that must withstand loads while maintaining some bending capacity.

Remember that you can also adjust the mechanical properties of your parts by varying the percentage of filling, regardless of the Shore hardness of the filament used.

Printing orthopedic insoles is one of the most popular applications of Filaflex. Here we explain the basic process:

1. Recommended software: You can use open source software available on the market such as:
   • Meshmixer
   • Blender
   • FreeCAD
   • Fusion 360
2. Foot scan: For custom templates, it is advisable to obtain a 3D scan of the user's foot.
3. Template design: Use the software to design the template with different support zones according to specific needs.
4. Variable density configuration: One of the advantages of printing templates with Filaflex is that you can configure different percentages of filling in different areas of the template, obtaining softer and firmer areas, all with the same filament.
5. Filament choice: Any filament in the Filaflex range is suitable. The choice will depend on the desired hardness in the final template.
6. Printing parameters: Use the recommended parameters for Filaflex, paying special attention to the percentage of filling in the different areas of the template.

This approach allows you to create completely custom orthopedic insoles with mechanical properties tailored to the specific needs of each user.

We have available, upon request, a declaration of conformity that indicates which Filaflex products use raw materials that comply with European standards and FDA regulations. In addition, our production, storage, preparation and delivery process complies with Good Manufacturing Practices regulations.

However, the certification of the final product is a responsibility that must be assumed by the agent that introduces it into the market depending on the transformation process and its specific use.

For specific applications, we recommend testing a small sample in its specific conditions and consulting with the relevant regulatory authorities before using Filaflex in products intended for contact with food.

Yes, Filaflex is a material compatible with skin contact at the cutaneous level, it is non-toxic and does not generate odors. Filaflex has been used and continues to be used to create many applications such as textile pieces and accessories, as well as insoles and prostheses that are in contact with the skin.

However, it cannot be introduced intracutaneously (inside the skin) and its use on wounds or ulcers is not recommended without carrying out the relevant toxicological tests for the application in question.

For specific medical or therapeutic applications, it is always advisable to consult with health professionals and carry out the necessary tests to ensure the safety of the final product.

To glue parts printed with Filaflex, we recommend using specific adhesives for TPU/TPE. Some effective options include:

• Polyurethane adhesives: They offer excellent adhesion with flexible materials such as Filaflex.
• Cyanoacrylates (Super Glue) specific for flexible plastics: There are special formulations for flexible materials that provide a durable bond.
• Silicone adhesives: They work well for applications that require the bond to maintain some flexibility.
• Flexible epoxy adhesives: For stronger joints that maintain some flexibility.

Before applying the adhesive to the entire piece, we recommend performing a test in a small area to verify the compatibility and effectiveness of the adhesive with your specific Filaflex filament.

To polish any piece printed with Filaflex, we recommend using a dremel very gently and then adding a little heat with a hair dryer. In other materials, such as ABS, an acetone bath could be used to polish the pieces, but this solution does not work with Filaflex.

Other techniques to improve the finish of parts printed with Filaflex include:

• Printing parameter adjustment: Reducing the speed and optimizing the temperature can significantly improve the surface finish.
• Gentle sanding: Using very fine grit sandpaper (600 or higher) with great care can smooth imperfections.
• Controlled heat treatment: Applying moderate and uniform heat with an industrial hair dryer or heat gun (maintaining a safe distance) can help smooth the surface.
• Coatings: There are specific coatings for TPU that can improve the visual appearance and texture of the parts.

Remember that flexible material like Filaflex has limitations in terms of the surface finish that can be achieved compared to rigid filaments.

No, Filaflex is not a biodegradable material, but it is recyclable. That is, if you have manufactured a piece completely with Filaflex, you could melt that material again and create a new recycled Filaflex filament. If you are interested in a recycled flexible filament, we recommend our Reciflex filament, a 100% recycled TPU flexible filament.

Parts printed with Filaflex can be recycled in several ways:

1. Home recycling: If you have the appropriate equipment (shredder and extruder), you can shred your Filaflex parts and convert them into new filament. Keep in mind that this process may require specific adjustments due to the properties of TPU.
2. Filament recycling programs: Some companies and communities offer collection programs for 3D-printed parts for recycling. Find out about local initiatives that accept TPU.
3. Creative reuse: Before recycling, consider whether the parts can be reused for other projects or applications.

Remember that for effective recycling, the parts must be clean and free of contaminants such as adhesives, paints, or other materials that are not TPU.

Reciflex is our flexible filament made with 100% recycled TPU, designed for users looking for more sustainable options without compromising quality. Main features and differences with Filaflex:

• Origin of the material: Reciflex is made with recycled TPU, while Filaflex uses virgin TPU.
• Sustainability: Reciflex has a smaller environmental footprint by giving a second life to materials that might otherwise end up as waste.
• Mechanical properties: Although Reciflex maintains good flexibility and elasticity properties, there may be slight variations compared to Filaflex due to the nature of the recycled material.
• Applications: Reciflex is suitable for most Filaflex applications, especially for projects where sustainability is a priority.
• Printing parameters: The printing parameters are similar to those of Filaflex, although they may require small adjustments depending on the specific printer.

Reciflex represents our commitment to the circular economy and the reduction of the environmental impact of 3D printing.

The environmental impact of Filaflex compared to other filaments should be considered from several aspects:

• Durability: Filaflex produces very durable parts that have a prolonged useful life, which reduces the need for frequent replacements and, therefore, reduces the consumption of resources in the long term.
• Recyclability: Unlike some biodegradable filaments that can degrade under specific conditions but are not easily recyclable, Filaflex can be melted and reused multiple times.
• Energy efficiency: The printing temperature of Filaflex (190-220°C) is relatively low compared to some other technical filaments, which may result in lower energy consumption during printing.
• Emissions during printing: Filaflex produces very low levels of emissions and odors during printing compared to materials such as ABS.

Although it is not biodegradable, its ability to be recycled and its long useful life contribute to a favorable environmental profile in the context of 3D printing materials.

At Recreus, we are committed to sustainability in all aspects of our operation. Some of the measures we implement include:

• Process optimization: We continuously improve our production processes to reduce energy consumption and minimize waste.
• Internal recycling program: We recycle production waste to create our Reciflex filament, thus closing the production cycle.
• Sustainable packaging: We work to reduce the environmental impact of our packaging, using recycled and recyclable materials whenever possible.
• Research and development: We invest in R&D to develop more sustainable filaments without compromising quality and performance.
• Logistics efficiency: We optimize our distribution routes to reduce the carbon footprint associated with the transport of our products.

Our goal is to lead the industry not only in quality and innovation, but also in sustainable practices that contribute to a greener future for 3D printing.

Minimizing waste when printing with Filaflex is not only beneficial for the environment, but also for your wallet. Here are some effective strategies:

• Design optimization: Design your models to minimize the need for supports, which are often discarded after printing.
• Precise parameter adjustment: Correctly configure the printing parameters to avoid failures that result in failed prints and material waste.
• Scale prototype printing: Before printing large parts, consider making reduced-scale versions to verify the design and parameters.
• Reuse of failed parts: Save failed parts or remnants for later recycling or use in smaller projects.
• Proper printer maintenance: A well-maintained printer produces fewer printing failures and, therefore, less waste.
• Correct storage: Store unused filament properly to prevent it from absorbing moisture and deteriorating.

By implementing these practices, you will not only contribute to sustainability, but also maximize the value of your investment in Filaflex.

Filaflex stands out from other flexible filaments in several key aspects:

• Quality and consistency: Filaflex is manufactured under strict quality controls that guarantee a constant diameter and uniform mechanical properties, which results in more predictable and reliable prints.
• Variety of hardnesses: We offer a wide range of Shore hardnesses (60A, 70A, 82A and 95A) that allow you to choose the exact level of flexibility needed for each application, while many competitors offer more limited options.
• Recoverable elasticity: Filaflex has an excellent ability to recover its original shape after being stretched or compressed, surpassing many other TPUs on the market.
• Abrasion resistance: Our filament offers superior resistance to wear and tear, making it ideal for applications that require long-term durability.
• Ease of printing: Despite being a flexible material, Filaflex is optimized to minimize common problems in printing flexible filaments such as stringing and jams.
• Chemical resistance: Filaflex offers good resistance to oils, greases and many common solvents, surpassing other flexible filaments in this aspect.

These characteristics make Filaflex the preferred choice for professional applications and projects that require consistent and high-quality mechanical properties.

You should consider using Filaflex instead of rigid filaments like PLA or ABS in the following situations:

• When you need flexibility or elasticity: For parts that must bend, stretch or compress during use.
• For impact absorption: When the part must cushion blows or vibrations.
• To improve grip: On handles, grips or surfaces that require greater friction and comfort to the touch.
• In applications that require sealing: For gaskets, seals or parts that must adapt perfectly to other surfaces.
• For parts that will be in contact with the skin: Filaflex offers a more pleasant and less rigid feel than hard plastics.
• When fatigue resistance is required: For components that will bend repeatedly without breaking.
• For applications that require chemical resistance: Filaflex has better resistance to certain chemicals than some rigid filaments.

However, rigid filaments are still preferable for structures that require high rigidity, exact dimensional accuracy, or resistance to high temperatures.

Although Filaflex is based on TPU (thermoplastic polyurethane), it offers several advantages over generic TPUs available on the market:

• Specialized formulation: Filaflex uses a specific formulation developed and refined over years to optimize its performance in 3D printers, while many generic TPUs are adaptations of industrial materials not specifically designed for 3D printing.
• Consistency between batches: We maintain strict quality control that ensures that the properties of the filament are consistent between different production batches, which does not always happen with generic TPUs.
• Stricter tolerances: Filaflex is manufactured with stricter diameter tolerances (±0.03mm) than many generic TPUs, which results in more constant feeding and fewer extrusion problems.
• Less hygroscopic: Our specific formulation makes Filaflex less prone to absorbing moisture than many generic TPUs, which facilitates its storage and improves printing quality.
• Better balance of properties: We have optimized the balance between elasticity, resistance and ease of printing, while generic TPUs usually prioritize only some of these properties.
• Specialized technical support: We offer specific technical support for printing with our filaments, with specialized knowledge about best practices and solutions to common problems.

These differences make Filaflex a superior option for users looking for professional and consistent results in their flexible prints.

Yes, Filaflex can be combined with other materials in multimaterial prints, although there are important considerations to take into account:

• Printer compatibility: You will need a printer with capacity for multiple extruders or a filament change system.
• Adhesion between materials: Filaflex adheres well to materials such as PLA, PETG and ABS, but the strength of the bond may vary. To improve adhesion:
  • Make sure the interface layers have enough contact surface
  • Consider designing mechanical interlocks between the materials
  • Adjust the printing temperature to optimize the fusion between materials
• Design considerations: Keep in mind the different contraction and expansion properties of the materials when designing multimaterial parts.
• Printing parameters: Each material will require its own optimal parameters, which can complicate the printing configuration.
• Common applications: The most popular combinations include:
  • Filaflex + PLA: To create rigid objects with flexible components or grips
  • Filaflex + PETG: For applications that require chemical resistance along with flexible components
  • Filaflex + TPU of different hardness: To create gradients of flexibility in the same piece

The combination of Filaflex with other materials opens a world of possibilities for creating objects with mixed mechanical properties, such as rigid parts with flexible joints or hard components with soft-touch surfaces.

There are several key differences between Filaflex and flexible filaments from other brands:

• Hardness specificity: Filaflex offers specific and consistent Shore hardnesses (60A, 70A, 82A, 95A), while many generic "Flex" or "Soft" filaments do not accurately specify their hardness or use vague terms such as "semi-flexible" or "medium-soft".
• Experience and specialization: Recreus has specialized exclusively in flexible filaments since 2013, which has allowed us to perfect our formulations, while many other brands offer flexible filaments as part of a wider range without the same specific dedication.
• Mechanical properties: Filaflex offers a better balance between elasticity, tensile strength and elongation at break compared to many competitors.
• Printing behavior: Our filaments are optimized to minimize common problems in printing flexible materials, such as stringing, inconsistent retraction, or jams.
• Dimensional stability: Filaflex maintains its shape better after printing, with less deformation or shrinkage than many alternative flexible filaments.
• Consistency between colors: We maintain the same mechanical properties between different colors of the same type of Filaflex, something that does not always happen with other brands where the pigments can significantly affect the properties of the material.

These differences make Filaflex a more predictable and reliable option for professional applications and projects where consistency and quality are priorities.

Filaflex and 3D printing offer numerous advantages over traditional methods of manufacturing with elastomers:

• Customization without molds: 3D printing with Filaflex eliminates the need for costly molds, allowing the economic production of personalized designs even in small quantities.
• Complex geometries: Internal complex shapes, channels and structures can be created that would be impossible or very difficult to manufacture with traditional methods.
• Rapid prototyping: Allows you to iterate designs quickly, drastically reducing product development time compared to traditional methods.
• On-demand production: Eliminates the need for large inventories, as parts can be produced as needed.
• Variable density: 3D printing allows you to create zones with different densities and mechanical properties within the same part, something difficult to achieve with traditional methods.
• Less material waste: Additive manufacturing uses only the necessary material, unlike traditional subtractive processes.
• Accessibility: 3D printing technology has democratized the production of elastomer parts, allowing small companies and individuals to manufacture components that previously required industrial facilities.

However, for large-scale productions or applications that require very specific properties, traditional methods such as injection molding may still be more efficient. Filaflex offers a complementary alternative that shines especially in customization, prototyping, and short runs.

At Recreus, we are constantly researching and developing new formulations and technologies to improve and expand the capabilities of Filaflex. Some of the areas in which we are working include:

• New hardnesses and properties: We are exploring the creation of new hardnesses and properties for Filaflex, such as greater resistance to abrasion or better behavior at high temperatures.
• Improvements in printing: We are working on further optimizing the printing parameters and printing techniques to obtain better results with Filaflex.
• Compatibility with more printers: We are collaborating with printer manufacturers to ensure that Filaflex is compatible with as many models as possible.
• Specific applications: We are developing specific solutions for industries such as automotive, aeronautics, and medicine, where Filaflex can offer unique advantages.
• Sustainability and recycling: We are researching ways to improve the sustainability of Filaflex, including the development of recycled filaments and the reduction of waste in production.

These are just some of the areas we are working in. If you have any suggestions or ideas to improve Filaflex, do not hesitate to let us know.

To stay up to date with the latest news and updates on Filaflex, we recommend:

• Subscribe to our newsletter: You will receive news and periodic updates on Filaflex, including news, tutorials, and printing tips.
• Follow our social media: We are present on platforms such as Twitter, Instagram, and Facebook, where we share news, tutorials, and content related to Filaflex.
• Visit our blog: We publish articles and tutorials on 3D printing, Filaflex, and related technologies.
• Join our community: Participate in our forums and discussion groups to connect with other Filaflex users and share experiences and tips.

In this way, you can stay up to date with the latest news and updates on Filaflex and take full advantage of its capabilities.

There are several ways to contact our support team:

• Email: You can send us an email to info@recreus.com for any questions or doubts.
• Contact form: Available on our website https://recreus.com/es/contacto.
• Phone: You can call us at +34 865 675 216 during office hours (Monday to Friday, 9:00 - 18:00 CET).
• Social networks: You can also contact us through our profiles on social networks such as Twitter, Facebook, and Instagram.

Our support team is made up of experts in 3D printing and Filaflex, and they will be happy to help you with any questions or problems you may have.

We offer a wide variety of resources to help you get the most out of Filaflex:

• Recreus blog: We regularly publish articles, tutorials, and case studies on our blog https://recreus.com/es/blog.
• YouTube channel: We have a YouTube channel with video tutorials, tips, and demonstrations: https://www.youtube.com/c/Recreus3D.
• Printing guides: On our website, you will find detailed guides on how to print with Filaflex on different printers.
• Community: We have an active community of Filaflex users where you can share experiences, ask questions, and see projects from other users.
• 3D models: We offer a collection of 3D models optimized for printing with Filaflex that you can download for free.

These resources are designed to help you take full advantage of the capabilities of Filaflex, regardless of your level of experience in 3D printing.

Yes, we offer personalized technical support for specific printing problems with Filaflex. Our technical team can help you with:

• Problem diagnosis: Identification of the root cause of printing problems such as jams, stringing, underextrusion, etc.
• Configuration recommendations: Personalized advice on the best printing parameters for your specific printer model and the hardness of Filaflex you are using.
• Hardware compatibility: Information about the compatibility of Filaflex with your printer and possible necessary modifications.
• Model optimization: Tips for optimizing your 3D models for printing with flexible filaments.
• Advanced troubleshooting: Assistance with complex problems that may arise during printing with Filaflex.

To receive technical support, simply contact us through any of the channels mentioned above, providing as much detail as possible about your problem (printer model, type of Filaflex, configuration used, photos of the problem, etc.).

You can purchase Filaflex through several channels:

• Official online store: Our online store https://recreus.com offers our entire product range with international shipping.
• Authorized distributors: We have a network of authorized distributors in different countries. You can find the nearest distributor on our website.
• Specialized stores: Many physical and online stores specializing in 3D printing sell our products.
• Marketplaces: You can also find Filaflex on platforms like Amazon, although we recommend verifying that the seller is Recreus or an authorized distributor.

When buying Filaflex, be sure to acquire the original product to guarantee the quality and properties that characterize our filaments. Counterfeit products may not offer the same performance and could damage your printer.

Yes, we understand that testing a material before committing to a full purchase can be essential — especially for professional or technical applications. That’s why we offer the following option:

• Samples for professionals: If you are a company or professional evaluating Filaflex for a specific project, we can provide you with a 50g sample of the filament. The sample itself is free — you would only need to cover the shipping costs. Simply contact our sales team to request your sample and we’ll be happy to assist.
• Test kits: We periodically launch test kits that include small amounts of different Filaflex hardnesses, allowing you to experiment with several options.
• Events and fairs: At 3D printing events and fairs, we usually offer samples and demonstrations of our products.

Consult our website or contact our team to know the sample options currently available.

If you have experienced any problem with a Filaflex product, we would like to know so that we can help you and improve our products. To report a problem:

1. Contact our customer service: Through email, phone, or the contact form on our website.
2. Provide product details: Include the type of Filaflex, color, diameter, batch number (if available), and purchase date.
3. Describe the problem: Explain in detail the problem you have experienced. Photos or videos are very useful to help us understand the situation better.
4. Information about your configuration: If it is a problem related to printing, provide details about your printer, configuration, and any other relevant factor.
5. Proof of purchase: For problems related to the guarantee, it is useful to have the proof of purchase on hand.

We commit to respond to all queries as soon as possible and to resolve any problem satisfactorily. Our customers' satisfaction is our priority.