In addition to the printed parts you will need: - 2x 626 bearings (cheap on Ebay) - 1x 6mm threaded rod, 95+mm long - 3x M6 nuts OR for the "608" parts: - 2x 608 bearings - 1x 8mm threaded rod, 95+mm long (better to cut after assembling to make sure) - 3x M8 nuts Please note that I haven't printed and tested the 608 parts as I don't have the hardware for those at the moment.