I have updated this design and added files for a square bit holder and a collet holder. Updated files can be found here ---> https://www.thingiverse.com/thing:3881501

A simple holder for 6 1/4" (6.35mm) router bits. 3/8' (9.53mm) can fit tightly, or if scaled up slightly. Designed to screw to a vertical surface and hold bits out at a slight angle for easy access.