Quote Originally Posted by bob_3000 View Post
Great set up, I'll be making one.

I have the same M12 "dremel", (to be honest I have basically every M12 tool made and have recently started my M18 kit)...what is the white plastic fan looking part behind the collet?
It is indeed a homemade fan. The full story is here...

Dremel fan

Although I have the equipment to make gears, I used the TLAR approach to make the fan. Any minor unbalance in the 1" diameter device isn't going to be a problem.