Adjustable size filament spool holder

This is a version of bwevans "Mosaic Feet & Spool Holder", adapted to use M8 threaded rods and 608ZZ ball bearings.

The attached stl and scad files feature a slightly taller foot with a 8mm hole instead of 6mm.

Here is a short time lapse video of the spool holder in action: http://youtu.be/UQoSdxPS8tI