Simple magnetic bit holder made for multiboard. The magnets make the bits ‘snap’ to the holder and hold them securely. It is held to the board by a multipoint big thread. 

The piece can hold a total of 12 5x1mm neodymium magnets like these. It also works well with 8 magnets. You should pause the print at the right layer and press 2 magnets per hole into the print.