Printed out a few dozen starfish,drilled a small hole in them and threaded a ribbon through them. Put the train around the base, and voila, classic Christmas Tree via 3-d printer. We're sending these ornaments out with a bunch of our holiday cards this year.Print out starfish (the files attached to this thing print the starfish in pairs so it is a bit faster if you are printing a lot) and use a 1/8" bit (or near to it) to drill holes. Thread Ribon. Trim Tree. Sing carols.