A simple screw and bitholder you can attach to a Einhell screwdriver using a M420mm screw. You have to pause the print at a certain layerheight(18.9mm) and put 3-4 Neodym 103mm Magnets in.
bitholder_einhell.f3d | 160.2KB | |
bit_and_screwholder_einhell.stl | 18.0KB |