Customizable Spool Bushing with Bearing options

This is a customizable spool bushing that you can change the parameters. Nothing much about this but it does makes the spool rolls more smoothly on my spool stand pipe. I also included an option to have bearing slot. Just punch in the figures and there you have it.

It seems like having rcount=10, have a bug in openscad where the 9th and 10th ring didn't show up, better avoid punching in 10 for rcount unless you want it

The idea is actually from this guy http://www.thingiverse.com/thing:783