Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1310376.

This is a simple handle for a shaft based tool, like a screw driver or a file. Customizable for diameter, height, number of indents and tool shaft diameter.

The STL file includes a divot around the base, however the Customizer doesn't like the minkowski function and the script times out. I've added a parameter to enable/disable it, which is set to false. You can always download the SCAD file and open it on your computer.