This Best Practice describes printing flexible parts on Connex™ 3D Printers using two
flexible materials—one for the part’s core and one for its coating.  The core material affects the part’s rigidity (shore value) and its memory speed. The coating material affects the elongation-at-break and color.  Increasing elongation-at-break, for a given shore value, increases tear resistance.

Practical applications include:
• Realistic simulation of rubber elastomers
• Impact resistance testing
• Semi-rigid, soft-touch parts
• Complex assemblies of flexible parts
• Parts with varying degrees of flexibility


A. Select Appropriate Core Materials Use TangoBlack as the core material to increase memory speed. Use Tango Gray™ as the core material to increase rigidity and tear resistance.

B. Select Appropriate Coating Materials TangoPlus™ and Tango BlackPlus have high elongation-at-break values. Use either of them as the coating material to enhance tear resistance. This will also bring the elongation-at-break value close to that of parts printed with TangoPlus materials alone.

C. Select a Coating Thickness For best results, a coating material thickness of 0.3 mm is recommended. The coating thickness does not affect the external dimensions of the object, which remain unchanged. The coating layer replaces part of the main model material.

For more information, download the full document here.

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