Printed at 100% scale will launch a toothpick and at 200% as pictured will launch a Q-Tip. Just need to loop a rubber band (or as in my case one of your wife's hair ties) through the eyelet and hook on either side. Would recommend printing the shaft separate or painting supports on only it as the internal supports on the benchy were a little difficult to remove. If you do like I did and print with supports throughout an allen wrench down the barrel will remove them.