Direct additive manufacturing of commercial silicones is an unmet need with high demand. We report a new technology, Heating at a Patterned Photothermal Interface (HAPPI), which achieves AM of commercial thermoset resins without any chemical modifications. HAPPI integrates desirable aspects of stereolithography with the thermally-driven chemical modalities of commercial silicone formulations. In this way, HAPPI combines the geometric advantages of vat photopolymerization with the materials properties of, for example, injection molded silicones. We describe the realization of the new technology, HAPPI printing using commercial Sylgard 184 PDMS resin, comparative analyses of material properties, and evaluation of a heat transfer model to assist in further development.

Additive manufacturing of silicone by heating at a patterned photothermal interface

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