A centrifuge is a must in every molecular lab. It is used for speeding up diffusion processes. Basically a high RPM carousel for bio samples that will separate solids and liquids into distinct layers, which you can later separate using micro-pippetes layer by layer.
caveats & challenges:
- set RPM so that plastic (3D printed part does not explode by high centrifugal forces)
- learn how to use powerfull brushless motors and arm them using microcontroller and an ESC to drive power to it