I printed out the panels in transparent green Hatchbox PLA. Once each panel was printed, I glued five together using hot glue, and fixed the fourth using magnets. Inside, I placed a green LED, batteries, resistors, and a switch. For the paint, I used matte black spray paint from the hardware store. I simply sprayed the cube straight down in bursts from relatively high up until I got the coverage I desired. I am very happy with this print. Thanks to the designer.