Educational object, to understand how universal joint works. Additionally needed: M3x10 (or 12) bolt 8 pcs M3 nuts 12 pcs M3x14 or longer (for shaft) 4 pcs Also, shafts can be printed in vertical position, for safer printing, they can be attached with thin line (this object is also prepared, included). Optional: I used small magnets to lock the holder to some metallic surface. Magnet dimensions: d8x3 mm, hole 3 mm, mounted with d2.5mm screw. Licence: https://creativecommons.org/licenses/by-nc/4.0/ Assembly instructions on MyTechFun youtube channel. https://youtu.be/g0EE_gVuJZA