***Update: Here is version 3.0. All in one, print in place design, sides fold up and snap into place. Adjustment ridges, fits any spool!
Here is an adjustable spool holder to spin your spools of filament smoothly. Same design and size as the PB spool holder but adjustable so it will hold any spool.
Requires 4 skateboard bearings.
Here is a video of it you can check out: http://youtu.be/u_qMbNZcKYE
The tolerances on the adjustable base are set at .6mm. That's the best my printer can handle. It prints fine and is very smooth. I did .3mm layer height.
My shells are messed up in the photo because I am experimenting with extrusion width.