HDD microcentrifuge rotor

thingiverse

Simple rotor, for holding 1.5-2mL eppendorf microcentrifuge tubes. It will fit onto the spindle of a standard 3.5 inch hard disk drive. The spindle mounting hole is slightly undersized. This is by design, you'll have to sand it out until you get a friction fit.I recommend using the HDD's own screw mount to then secure the rotor to the spindle. This project is a stupid idea, please keep in mind that anything spinning this fast can do a lot of damage if (when) it breaks loose. Hard drive bearings were not designed for this, and you'll never get it balanced just right. Having said that, it does work. Sort of. https://youtu.be/gciqM43uoA0 UPDATE: Made a second version that is much better balanced. The trick to canceling out errors in my 3d print was to print in multiple parts and then to glue them together on the spindle. It's a little nerve-wracking, but the time it takes for the epoxy to cure is just enough to balance the rotor by eye, turning at low speed (by hand). Perhaps you won't have any issues with your 3d printer, but it doesn't take much to throw off the balance unfortunately. https://youtu.be/3I_iUl1r784