I have less than $20 in mine and it works great..

I got my screen on ebay.. http://cgi.ebay.com/ws/eBayISAPI.dll...MEWN%3AIT&rd=1

for a motor I used the oscillating motor out of a fan(not the motor that turns the blade but the motor that makes the fan turn back and forth) the output is about 4 or 5 RPM.

these things are easy to build and there is no reason to pay a lot of money for one...
Bender Reviewed by Bender on . I want to make a kief tumbler I imagine converting a rock tumbler. Or perhaps getting a small electric motor and pully and see if I can make one from scratch. I have access to a CNC and all woodworking equipment. Has anyone heard of a tumbler to separate kief? Has anyone made one, or better yet have plans? What mesh screen is best for separating kief? I understand that silk screen material is best, but there are many different mesh sizes. I searched for this but there is very little info, at least on tumblers. Rating: 5