This holder is designed to be mounted on a Ø 32 mm pole. I provided the original FreeCAD file containing a parameters spreadsheet, so that anybody can adjust this for their own needs.  

The handle consists of two parts: the inner pusher and outer nut. Both should be printetd together from the handle.stl file. I added both parts as separated files for multi color printing (like in one of my photos). 

The design is modular, the tool part can be replaced. Looking forward if anyone coes up with a new mod..