I made this to support a 5lb spool of Black PLA I got from http://ultimachine.com/. It works but I am likely to draw up something that allows the thing to roll with less friction. The spool is leaving black wear marks on the part.

Customized version of http://www.thingiverse.com/thing:44906

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=44906

Using the following options:

spool_hole_diameter = 37
spool_width = 130
unit = 1