200mm (8") LED strip holder for the back of the x-axis bar. Insert the 10mm wide LED strip into bar then just insert bar into v slot. It hangs in place very well and does not need to be inserted from the end.
Photo shows view of how the lighting from the LED bar looks. You can see how well the LED strip lights the bed along with one from the Bullseye LED holder... https://www.thingiverse.com/thing:3242063 ... with both you can easily see what is printing.
Seeing the black filament on the black bed of the Ender 3 has always been difficult until I added this light bar.
Just print, insert LED and slip into place.