LED Christmas tree. Route LEDs through the channels in the back. Quick and easy print. Two pieces snap into place. Uses cheap LEDs from Target. (i used these)

https://www.target.com/p/30ct-battery-operated-led-twinkling-christmas-dewdrop-fairy-string-lights-multicolor-with-silver-wire-wondershop-8482/-/A-79195584#lnk=sametab