Simple screwdriver for a 1/4″ bits. I designed a 5×2,5 mm gap for a small magnet. It is not mandatory, but may be usefull if yours bits are too loose. Simply use Pause at height/layer option in slicer software and put magnet while printing.
Filament PETG or similar, no supports. Raft or brim: maybe. Depends bed adhesion.