This is a dual color bit holder with the logo of Hogeschool Windesheim, which is given as a gift to students, most recently at the start of the minor Factory of the Future at Perron038 in Zwolle. It can also be a nice promotional gift, so I'm sharing the files here.

We then put the two most commonly used hex bits in it, M3 and M4. But other hex bits fit of course (fit varies a bit per material and 3D printer).