About this 3D model

This is a larger version of my ratchetting mini-driver, but that uses full-sized ¼" hex shank bits. It also has storage in the handle for 6 bits up to 55mm long. Just put your bit in one end for screwing in, or in the other end for un-screwing. I printed this in PLA, but a carbon fiber filament might be better. Use 0.2mm layers. No supports are needed.