This will fit thin DMC bobbins that are ~1mm thick. The slots on this design are 2mm so will fit any bobbins that aren't <2mm thick. There is a slot to glue a small magnet on as well, it will fit a 15mm by 2mm magnet. You can find the magnets here on amazon.
embroidery_bobbin_rack_2mm.stl | 38.1KB |