A simple addition to the "vintage" ultimaker protobox. Only modification to the printer are 4 additional holes in the printing bed. Print 2 x main body 2 x main body mirrored 4 x head-magnet-center 4 x head-VK 4 x nut.stl Drill 4 x 5mm holes with a hole spacing of 213.5 mm (always check that your magnets are really 5mm) Install all the components