We live in a very remote area and I got tired of going to the store for remodeling supplies like this. Most of the other models I've found online for a two gang box have required a lot of supports and look really ugly when they are done. So I designed this from the ground up to be 3D printer friendly. No supports necessary. Most standard boxes are PVC (not a 3D print friendly). For comparable safety, use PEGT, ABS, or anything that has an HDT of 60C or higher, and isn't flammable.