This is a remix of a hand held drill guide by dj_abi. I found that using a rigid filament (PLA) didn't provide a secure fit to my drill so I redesigned the clamp part to include a TPU insert tapered appropriately to my Hitachi DS18DSAL cordless drill. This gives a nice snug fit that can be put on and taken off easily but stays on securely during use. The guide part is the same one made by dj_abi.

I used 5/16" old fiberglass tent poles for the guides and glued them into the guide plate.