Here is a centrifuge created by Cathal Garvey called DremelFuge. It can be found here:
It uses standard 1.5ml/2ml Eppendorf/Microcentrifuge tubes. Works with both a drill or Dremel.
I was trying to get it printed out but I was having trouble with it. So I decided I would try to make my own from parts laying around. It consists of a 3.5 inch PVC plumbing cap and a bolt, nut and washer. As seen below I have it running on a drill press. I did try it on a dremel, it worked, but I would not use it that way unless a closed off compartent is built for it (later project).
|Working in drill press|