Hand Drill - large sizes

A slightly more parametric version of the above thing. I needed a quick handle for a 5.5mm bit, and this turned out to work quite well.

You can scale the bit holder and screw cap with a single parameter. To adjust the handle, you will still have to adapt a bit more to your needs. It has a few unparametric template objects to cut off the handle (for smaller build surfaces) and reshape the handle grip (to make it more comfortable). The scad file requires the stl files of the above thing.