two big disk magnets; two (or three?) small disk magnets; 3mm diameter axle pins for the precompiled stl files these should work: hight of both magnet types: 5mm diameter of big magnet: 25mm diameter of small magnet: 15mm possible source: https://www.magnet-shop.com/Neodymium-Magnets/Discmagnets/Discmagnet-%D8-250-x-50-mm-N50-Nickel-holds-86-kg::250.html https://www.magnet-shop.com/Neodymium-Magnets/Discmagnets/Discmagnet-%D8-150-x-50-mm-N40-Nickel-holds-48-kg::48.html