Heatsink Clip for Prusa NEMA17 Extruder

A simple clip to attach a common 40x40x10mm heatsink to the NEMA17 extruder motor.
This heatsink is available from many places. I got mine from [RS Components](https://uk.rs-online.com/web/p/heatsinks/6744769/).

Add a little thermal paste to the motor and smush it about with the heatsink to make sure of even coverage. Less is more with thermal paste. Too much won't help.
Slide the heatsink into the clip before pushing the clip over the motor. It should be pretty snug. Note the orientation s