Magnetic Stirrer
thingiverse
You need: Power supply DC 6V - 12V. LM2596 for speed change https://www.ebay.com/itm/1-23V-30V-DC-DC-Buck-Converter-Step-Down-Module-LM2596-Power-Supply-Output-1x/192257354634?_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D2%26asc%3D44040%26meid%3D04671371c0dd48038f50df335eee6d1d%26pid%3D100011%26rk%3D1%26rkt%3D8%26sd%3D122915032453%26itm%3D192257354634&_trksid=p2047675.c100011.m1850 Teflon coated stirrer (grab it from e-bay) 2x rare earth magnets
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