Parametric Spool Hub

This is my first thing! I designed a very simple (slightly) parametrized thing in OpenSCAD to improve my filament handling on my Prusa i3. This thing is simply a spoked hub to allow a filament spool to be run on a simple hoizontal rod supported above the printer frame,
The STL is configured for a 6mm pivot rod (ideally smooth!) and a spool with a 52mm hole (like supplied by 3DFilaPrint) for 100m reels of PLA.