Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1954624.

My son needed a T handle shaped screwdriver so here we go, it uses a standard driver bit adaptor that slots into the hole, (this is a tight fit on purpose) I used a hammer to 'ease' it in to the hole. use high infill for strength, and no supports needed, printed in just 52 minutes. please share if you print thanks