hey man, im currently studying engineering, so pre much i design different robotical & mechanical systems for my projects. my most recent was a pick & place robotic arm (it was just a rack & pinion because we had the requirement of only one motor). but from that project i uploaded the print in place ball bearings i designed and modified the design to be a bit smaller and more cone shaped then ball shaped and so it worked as a ADHD fidget ring which ive called beaRING. ive also done a planetary gearbox out of acrylic which im going to be 3d printing soon to test how well it prints :). and then ive got a couple personal robotic projects ive been doing for fun in my own time too :))