Tough Resin simulates the feel and many of the important mechanical properties of ABS plastic. Learn how to leverage Tough's performance.
ABS (Acrylonitrile Butadiene Styrene) is a very common thermoplastic that provides a good balance of strength and flexibility. Tough Resin creates strong engineering prototypes and has been developed to withstand high stress and strain. Consider using this material for works-like prototypes and assemblies, including designs with snap fit joints and living hinges. For further finishing, Tough resin can also be machined once printed. Tough Resin can be printed at 50 and 100 micron layer heights on both the Form 1+ and Form 2.
Toughness refers to a material’s ability to absorb energy before fracturing. When a tough material yields, it will undergo some deformation rather than just shattering. In other words, tough materials have a little more “give” than brittle ones.
Toughness is also defined as the area under a stress-strain curve. Tough materials generally have a good balance of strength (the amount of stress a material can withstand) and ductility (the elongation or percentage strain). Because of this, the area under a tough material's stress-strain curve is much larger than that of a very strong material with low elongation. This has a direct correlation to the amount of energy each material can absorb before failure. Formlabs Tough Resin has lower stiffness than the Standard Resins while withstanding more elongation.
- High-stress components
- Snap-fit functions and living hinges
- Cyclic loading
- Works-like/feels like ABS prototyping
- Geometrically accurate prototyping under load
Not recommended for
- Very fine features or thin walls
- Rigid or stiff prints
- High-temperature applications
- Constant loading
Comparison with Other Materials
Standard Resins (Postcured)3
|Modulus||2.5 GPa||2.7 GPa||2.8 GPa|
|Notched IZOD Impact Strength||234.9 J/m||38 J/m||25 J/m|
To learn more about the performance properties of each Formlabs resin, refer to the library of material properties datasheets.
Printing with Tough
Tough Resin should always be printed with supports, and printing directly on the Build Platform should be avoided whenever possible, due to the high likelihood that the print will be difficult to remove from the Build Platform.
For the easiest removal, remove the part immediately after printing, as the resin will still be warm and easier to get off. Should the part prove difficult to remove from the Build Platform, the platform can be heated up using a heatgun or blowdryer. After heating, the part can be more easily removed.
For very bulky parts, increase the support touch point size.
Wash your tough parts as recommended for parts printed with Standard Resins:
- Cover the rinse tub, shake for 2 minutes and let your part soak for 10 minutes.
- Move your part to the second rinse basket, shake and repeat for a total soak time of 20 minutes maximum.
- Remove part(s) from rinse bucket and allow to air dry.
The Tough Resin coloration comes from a pigment, not a dye, so tough parts will not color the IPA.
TIPEspecially with tough resin, leaving parts in IPA too long may cause the parts to become flexible and weak.
Post-cure Your Part
Tough (formulations TOTL03 and TOTL04) parts require 120 minutes of post-curing under a 30 W, fluorescent lamp emitting in the UVA range (such as a nail spa) at 60°C; flip the parts halfway, for 60 minutes on each side. Tough (formulations TOTL01 and TOTL02) parts require a minimum of 30 minutes at 45°C. You may use a lower wattage curing chamber (e.g. a sterilizer), but your post-cure time will increase. Time to reach full post-cure may also be longer for larger parts.
Formlabs’ post-curing solution, Form Cure, uses both temperature and 405 nm light for a fast and highly effective post-cure. Form Cure is available now for pre-order. Full setting recommendations for Form Cure will be available before shipping, and additional settings will be published as new materials are announced. Shipping begins in September 2017.
WARNINGYour Tough part will not reach its full mechanical properties without a thorough post-cure.
Refer to our detailed research on Post-Curing Prints for suggested lighting and temperature for post-curing.