About this 3D model

My filament roll wasn't moving very smooth straining the x-axis. The roll had a diameter of 32mm and it was put on a 8mm rod. This bearing snugs nicely in the 32mm hole, holding the 8mm threaded rod nicely. Much smoother now. I printed this with 0 infill and 2mm parameter and 2mm top and bottom. Prints nicely. Make two of these, screw on to 8mm rod from each end.