Ender 3 cable clip

Clip to help organize cables on the Ender 3.
Several attempted improvements/changes to the original. Original clip had the following issues for me:
- When clipped in, it was loose, wobbled around, wouldn't stay straight.
- Extremely difficult to remove. I gouged the paint on the extrusions trying to remove.
- There was no extra space for additional cables, such as a USB cable for Octopi.

This modified design attempts improvements in those areas.
The ends of the clip where it wraps around the beam is rounded and purposely a little short of completely clipping in. This makes for a snug fit that does not wobble.
Because the ends are rounded, that can be removed relatively easily. The vertical section is also thinned so it can provide some bend.
The vertical section has a hollowed out section big enough to accommodate a USB cable for Octopi routing.