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Using Tough Resin

Tough Resin is our most durable, adaptive, and impact-resistant material. Similar to ABS, it is ideal for engineering prototypes and has been developed to withstand high stress or strain. This material is perfect when you require great impact resistance for rugged prototyping, and can also be used for snap-fit joints, living hinges and parts that require post-print machining. Tough Resin can be printed at 50 and 100 micron layer heights.

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.

Ideal For

  • High-impact/high-stress components
  • Snap-fit functions and living hinges
  • Machining
  • Cyclic loading

Not suitable for

  • Very fine features or thin walls
  • Rigid or stiff prints
  • High-temperature applications
  • Constant loading

Comparison with Other Materials

  Formlabs
Tough TOTL021
Formlabs
Tough TOTL012
EnvisionTEC ABS-tuff3 3DS Visijet SL Tough4 Stratasys Digital ABS5
Tensile strength 41.3 MPa 52.2 MPa 48.6 MPa 41.0 MPa 55-60 MPa
Elongation 31% 31% 7% 18% 25-40%
Notched Izod 51.1 J/m 51.1 J/m no data 43.8 J/m 65-80 J/m

Tough Resin has a low Tg (glass transition temperature) and low heat deflection temperature. This means that thin parts under constant load may deform over time. Tough Resin is not intended for applications at elevated temperatures. For best results, alter your model to reinforce or thicken parts. You can use the Design Guide as a reference.

Finishing

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.
  • 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.

Tip

Especially with tough resin, leaving parts in IPA too long may cause the parts to become flexible and weak.

Finished functional wrench printed in Tough Resin.
Finished functional wrench printed in Tough Resin.

Post-cure your part

Tough parts require a minimum of 30 minutes of post-curing under a 30 W, fluorescent lamp emitting in the UVA range (such as a nail spa) at 45°C. You may use a lower wattage curing chamber (eg a sterilizer), but your post-cure time will increase. Time to reach full post-cure may also be longer for larger parts. Refer to our detailed research on Post-Curing Prints for suggested lighting and temperature for post-curing.

Warning

Your tough part will not reach its full mechanical properties without a thorough post-cure.

Contact Support

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