Spheroid Bearing, Mounts on 1 Inch PVC Pipe

See in action at http://youtu.be/8uS5_aBJgZs
.
Here's a spheroid bearing I designed to fit over 1" pvc pipe. The spheroid shapes helps keep the alignment, and the sleeve keeps it all together. It rolls well and appears to be able to take heavy loads.
.
I designed the tolerances so you can print all the moving parts in one print without support structures. Then print 2 of the sleeves to fit over the ends.
.
Feel free to modify to suit your purposes. Whatever you create, please cite t