This is a minimalistic screwdriver for hex bits. It is intended to be used in applications where not much force is needed, but it doesn't easily break either.

A small magnet can be glued to the bottom of the screwdriver to hold the bits in. The magnet should have a diameter of 6 mm (height 1 mm).

AliExpress Link: Neodymium Disc Magnets 6x1mm

Keep in mind that a higher resolution than 0.16 mm may result in a press-fit of the hex bits.

Edit: I added a ...V3.stl because I found the first version was too tight.