Screw Driver Bit Holder. There are two models: 1in (25mm) short bits and 2in (50mm) longer bits. Requires no support material. Simple and fast to print. After printing just fold the bit holder at the hinge to free up. There are two detents in the holder to keep it closed when not in use. Enjoy!

Update: I added a organizer base print profile for a 10 slot organizer.  This will hold both the short and long bits.