i created this as i am the only person in the house who eats microgreens. the seeds are placed on a single piece of kitchen towel folded into four. the lid will black out the ight for the first few days. then the led lights take over to green them up. my settings were PLA  with a 0.4 nozzle. using standard settings the tray is full of holes for drainage. i intend to mount a couple of strips of led lights in the arch for lighting. there is a hole for wiring for the led.