Made an easy to print CNC bit holder for 1/8" and 1/4" bits for my 3018 CNC. The 3.175 and 6mm bits also fit into this.
Just lay it flat, slice and print, no supports needed. Not sure why the STL file ended up on its backside, but just lay it flat, and print :D
Designed in Fusion 360
Made a simple design in Fusion 360 with variable parameters, so the bit holes easily can be changed with a change of parameter.