Printed on my UM at .2mm with 30% fill. Take one of the flexible LED strips that came with your UM kit, and fold it up to fit around the inside surface and stick it in place.

Loosen the screws around the top of the extrusion head enough that there is a nice gap between the aluminum and plywood surfaces. Insert the "tab" into the gap, then screw the aluminum plate back up squeezing the skirt in place.

Cut off one of the sets of wires, and feed the other set into the same hole the fan wires go and splice the LED wires into the PWM fan wires. Then when the fan is on, so are the lights. Also, by altering the M106 SSOMETHING value you can tone down the light output.