For some time I've toyed with the idea of building my own cnc router, or perhaps a printer. The idea, of having a tool which allows me to fabricate parts using a computer to control the process, is pretty compelling.
Home made Homemade Bead Roller for tubing: Grind the teeth off top and bottom, rod on bottom and a groove up top. Fine tune the rod on the bottom. Made to basically a "bump." This it two passes around the tube. Kinda sneak up on it.