DIY Chocolate Molds - Revisited Topic I think
Posted in: Geek Gear - Cool Tools (Read-Only)
3d print the positive and seal with an epoxy resin. Then make the negative using food safe silicone. I tried using 3d printed abs as a test run for personal use. Cleaning it was a nightmare and heating and cooling warped it. Not to mention the potential bacteria growth in-between poolry sealed layers. It's much easier, faster and more reliable to print a positive, have a low infil and then do what I said. If you have a very soft silicone it's even better since you can get away with having a single piece mould rather than a two piece. The key is 100000% in the prep of the positive. If you rush it or use the wrong resin to seal it you end up with the lines transfering into your moulds and then chocolate.
By sealing I mean sealing the ridges of each layer. Anotjer option I've explored is vacum forming using APET Plastic. It's food grade and usually comes around 5mm thick so it's dead durable. But it's expensive and requires a beefy vac former.