Orbital Shaker For Stir Plate

thingiverse

I needed an orbital shaker for my lab, but I didn't want to spend a fortune. I remembered a platform that could be bought and placed on a magnetic stir plate to transform circular motion into orbital motion. That still cost money, but it wasn't as bad, so I decided to design this myself. The holes in the magnet gear are designed to hold four 6mm x 3mm round neodymium magnets: https://www.amazon.com/dp/B07NV52KW3/ref=cm_sw_em_r_mt_dp_U_xE2mEb81M0T83 The polarities need to be swapped so two on one side face north, and two on the other side face south. Secure them with epoxy or cyanoacrylate glue. This design requires three prints of the Orbit Support Spinner and one print of the rest. It uses no bearings and relies on the small contact area at the tip of the support posts. I've run mine for several hours without any problems, so I recommend using simple candle wax to lubricate the interfaces.