Home made Homemade Bead Roller for tubing: Grind the teeth off top and bottom, 1/4" 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.
Interesting homemade tool from Instructables user Random_Canadian. The melt chamber consists of a length of 3/4" iron pipe, the piston head is an off-the-shelf socket wrench, and the piston rod is a socket extension. A temperature controller, a couple of eBay cartridge heaters, a few tufts of fiberglass insulation, and some odds 'n' ends make for a heating system. And a brass hose barb serves as the extrusion nozzle