Original Prusa i3 MK3 X-axis motor cable strain relief

**Update 18.09.19. I no longer own the Prusa printer so my ability to support this mod is limited.**

This is a very simple and elegant strain relief for the X-axis motor cable on a MK3. It closes around the motor and the cable and is then tightened with a zip-tie. Inside the cable grip it has small teeth that hold the cable in place.

Please be aware that it is meant to be used only with the textile sleeve. It will __not__ work with the older spiral wrap.

If your Prusa came with spiral w