Rostock Max spool "cartridge" system

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I created this design a long time ago because I believed the "wooden arm" on the Rostock Max was subpar. I built it to fit into the same slots as the wooden spool holder arm, allowing for easy cartridge changes and smooth operation on bearings. Use 5/16ths threaded rod, nuts, and 608 "skate" bearings with this design. These components can often be obtained for free at your local skate shop; while they may not be perfect, they will suffice for this application. You can see that I have a diverse selection of cartridges in my collection. I included several hub sizes here, but I do not use OpenSCAD and therefore did not create a parametric version. There are already numerous parametric spool hubs available online, such as these: http://www.thingiverse.com/thing:27748 http://www.thingiverse.com/thing:25843 http://www.thingiverse.com/thing:1405931 I appreciate your attention to this design.