I wanted a V-slot cover that could act as a diffuser for the LEDs I installed on my Ender 3 Pro. The original design fit in the v slot but wouldn't slide easily over the LEDs. Recommend PETG due to heat from LEDs. 15% infill used with 0.20 layer height. Current file is 9.75 inches/247.65mm and fits the top extrusion bar of the ender 3 pro.