Deluxe pulley for strings and ropes (openscad / parametric)

This is an openscad script to generate a pulley for strings and ropes. It uses a 608 ZZ bearing (the cheapest and most common ones, used for skateboards and rollers, about $1-2 on ebay).

With the source, you can tweak most of the properties, or use another kind of bearings.

The groove cover, attachment leg and top housing are optional.

I use these to lift bags of bird seed in my garage, out of reach of mices!

The pulley is to be screwed or nailed to a support on its own axis. However