Ender 3 Tray Design

Tray for Creality Ender 3. This is a remix of Holspeed's tray.

I made a few design and appearance changes: added rounds all over, and redesigned the front to be more aesthetically pleasing.

Also added a small cutout to the back right corner so that I could route the display ribbon cable neatly under the aluminum extrusion. This way the front of the printer is very clean with no cables out on view.