Printrbot Simple Metal Head Roll Clamp

**Expand the 2nd photo to see the annotations in the Photo!**

For owners of the Printrbot Simple Metal, have you noticed that if you grasped your extruder head and tried to roll it (think of a plane's pitch, roll, yaw), that you could get the extruder nozzle to roll about 1mm or more? This would or could cause some variability in the X direction when printing, either due to vibration or drag (due to interaction with the lower layer). This clamp basically fills the gap between the servo motor