Heater Block Wrench

*Update: added a [newer version](http://www.thingiverse.com/thing:1887169) to work with the new cartridge style E3D v6 heater block.*

Wrench for holding an E3Dv6 heater block while removing the nozzle. It's sized with a 20.2mm gap, but the design can be resized if the heater block is a different size or wrapped. Milled out of 1/4" aluminum (not printed).