Spool holder

Spool hub to replace the tube that came with my Ender. The threads will print without supports. I got better results using tree supports for the internal threads of the nut. I increased the support angle to 50 deg. on the hub to not print external supports for the threads and they printed well. The hub uses 608 bearings in each end. I cut off the original tube at the flange, glued the carriage adapter inside the tube, and a 5/16" x 5" carriage bolt.