I 3d printed my safety razor handle: https://www.printables.com/model/591133-tride-safety-razor

Pros: it works fine.

Cons: I have reprinted it about 3 times over the past two years because the top piece is thin and delicate. PETG seems to work better than PLA.

For blades: I've found that any name brand works OK, and the generic unbranded blades are garbage (painful tearing/snagging instead of cutting hair). I wish there was a way I could tell just by looking at the blades but I suspect its microscopic details on the edge. The sound and feel are very different though.