Aluminum Filled epoxy is a great material for short-run injection molds. It's tougher than 3D printed injection molds, and has better thermal conductivity and 3D printed injection molds. My goal is to still use 3D printer, but to create a positive and then pour the epoxy around the positive.

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I used EpoxAcast 655 + HT: https://www.smooth-on.com/products/ep...