TUMBLER DIY WINTER PROJECT. I have been wanting to do one of these finally got around to it this winter. Costs, bearings from B.C. Bearing $12. each, motor, stepper motor from auction site, one is for sale $35. each motor required a capacitor $10. each, I bought two, the motors have reduction units on the drive end. Pulleys were $8. each. Add to that the cost of 5lbs of SS pins, shop around for these prices are all over the map on these. Anyway in answer to the question, would I buy a factory edition rather than build one NO I'm satisfied with what I now have, this one will allow me to use tumbler barrels all the way up to the 20L water jug if I choose. I have jugs of varying size and degree of aggressive tumbling, depending on what I'm tumbling, 2hrs does the trick. RPM of tumbler is about 50RPM