MK8 Dual Extruder cover

This is a cover for the cheap MK8 dual extruder assemblies that you can find on geeetech or all over ebay. I like these extruders because they are cheap ($60-$90 for a dual assembly), but especially because they use cheap 6mm nozzles (which you can get on ebay or banggood for less than $0.50 apiece, compared to the $12 Monoprice or Flashforge want for replacements). As a result you never have to clean out a nozzle again (if it clogs I just toss it and put in a new one). The design includes a soc