Ender 5 Bed Strain Relief - Improved

Improved version of the [already excellent strain relief](https://www.thingiverse.com/thing:3443100) designed by [derandi3d](https://www.thingiverse.com/derandi3d/about). Improvements come primarily in the reduction of stress risers at the interface to the bed. I also removed the bolt and tailored the gap for a snug friction fit on my bed. You may find that you need to alter this slightly based on the tolerances of the bed.