Printrbot Simple Metal to J-Head MK V

## Situation
So you broke your Ubis hotend and don't have time to buy another, but you do have a [J-Head](https://www.hotends.com) lying around? Then -- *wow* -- that's a pretty specific situation you have there, but at least now you can do something about it.

## How
At first it looks like this isn't possible, the J-Head is too short to mount in a Simple Metal. But it can be done, there are two methods for using a J-Head on a Simple Metal:

1. Print [a mount](http://www.thingiverse.com/th