I've designed and 3d printed molds for people who make their own frag plugs and I'm thinking about making some myself. I've designed a few new molds this morning and I'll probably be ordering an emarco 400 kit this week. I have worked in decorative concrete for years and have used emarco a few times so I'm familiar enough to get quality pieces but any tips are welcome. Once I get some decent plugs/discs/tiles from the molds, I will share the stl files for the hexagonal molds. I already published several of the square ones I designed last year https://www.thingiverse.com/Grizfyrfyter/designs I'm choosing to use emarco because it doesn't need to be cured like Portland cement or hydrolic cement does and thin discs (4mm) are still very strong but still easy to cut.