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 sim