I made these for drilling out holes in 3D printed parts.

Open in Customizer.

Input the dimensions for the handle. Note that if you have drill bits measured in inches, you will need to change that at the top and then input your diameter AS A DECIMAL.

Print

Insert Nuts into the nut traps

Insert the drill bit

Insert set screws. You should be able to tighten them a lot, but do remember it is plastic.

Also
It appears on my computer that there is an issue with rendering the handle in Customizer. It cuts a small chunk out of the lower groove. It only appears in Customizer, however, once you export it as an .STL, it goes away.