Desktop rock tumbler / ball mill / rotary mixer

thingiverse

Updated with some gcode that I put together. It prints a cap and body pretty slow and with 0.1 mm layers at the threaded bits. I don't use a cooling fan and the parts came out really well. I had to cut a little off the top to make it flat where it curled slightly. Weighs ~52.5g with PLA. I am not a doctor, results may vary. https://youtu.be/MB1M9SMeyfQ This has been a fun little project to work on. It actually functions, unlike my previous ball mill design. The parts need to come out really, really good though for it not to leak. Designed around a motor that I got from an old printer. It already had the pictured gear set on there so I glued the drive gear on with CA. Initially I had use internal threads for the cap, but that leaked like a sieve. Changed it to external threads on the body and it doesn't leak from the cap at least. If your printer is tuned and properly extruding, this shouldn't be an issue. Just watch for first layer porn to happen. I've just noticed that the holder is perfect for a "finest nutrition" vitamin D3 bottle of 220 count. I think it might be possible to use that bottle and a printed Ninjaflex belt. More research required. I have 50g of Ninjaflex waiting for some new found purpose. Tested with Maker Geeks PLA, but something harder and more abrade resistant like perhaps nylon or polycarbonate would be better. Thanks go out to [ArcMatt](https://www.thingiverse.com/arcmatt/about) for his feedback and criticism, despite self proclaimed negativity :P Note: The thread tolerances are only 0.2, if your printer is not very dimensionaly accurate then I would suggest scaling just slightly.