Makerbot 2X Replica Top Mount Spool Holder v1

I had a variety of issues with the Makerbot rear spool holders, so I printed these. The spool holders can be mounter on the top of the printer. Each holder has two parts, a truss-based vertical holder, and a lateral support for stabilization. A half inch aluminum bar from Home Depot provides ($5) then supports the spools.

This is published as Version 1, as I may post a new truss which has a partially enclosed rod holder (as opposed to fully enclosed). The idea here is that the rod can simply be held in place by pressure, and lifted out to swap out spools.