This tiny crossbow will easily fire a cotton swab across a room. Prints in two pieces, crossbow and nock. The legs are print-in-place and must be hand-oriented after printing. Clip one end of the swab off first. Attach the nock, string the bow and you're ready to go, Joe! Those blocks in the background of the photo? They're Dungeon Blocks, ABC blocks emblazoned with fantasy RPG creatures and dungeon scenery.