For a long time I've been using a flashlight to peer into the underworld of my 3D printer. I felt it was finally time to add it directly into the machine. When the fan duct got an upgrade I decided this was the perfect opportunity. This is the V4 duct with mounting holes for 2 LEDs. The wires conveniently fit between the top of the duct and the bottom of the bearings so they don't rub or get in the way. Connected to a stand alone 3V power supply with a switch.
Do Not print this in PLA. It will warp over time (100+ hrs) and eventually interfere with the print.