Another Aluminatus Spool Holder

I loved g00bd0g's original spool holder (http://www.thingiverse.com/thing:46654), but it only works on the first batch of 50 printers. Printers in the second batch have a metal plate on the back which prevents you from mounting that spool holder on the back; and if you mount it on the front, you lose 4-6" of vertical travel.

This spool holder is nowhere near as pretty as the original, but it fits on the back of a second batch printer, and even is loose enough to hop over the screw heads that