15 Piece ER11 Collet Holder
Simple ER11 Collet Holder. I suppose that the top can be fitted with a knob or handle and the bottom can be used to store bits and pieces... I uploaded the DWG for anyone who wants to tinker.
I cut my top out of polycarbonate rather than printing it to give me a surface to write collet sizes on with a dry erase. I have included a DXF of the top too in case someone wants to do the same.