Super simple MendelMax spool support.

I made this supports to hold 10 and 8 centimeter wide spools on top of my MendelMax 1.5. Each support uses an 8mm long M3 socket head bolt, a drop in nut (http://www.thingiverse.com/thing:245103), a 15mm M6 bolt and 6mm inner diameter, 17 outer diameter ball bearing.

The supports fit very snuggly in the 20x20 extrussions, I think they could be used for other things, besides holding spools.