Use ABS for bend properties. Crossbow bends more on left than it should. Use string about 57.25mm :) the gap between knots. Glue parts to gether. Small plastic part in arc is downwards. Maybe a printed string. I got better results using 0.2mm layer height than with 0.1mm?!? Use eye protection if using againts people. (not for your self...) TODO: Make it not thump release but a mechnacilal release system as I wanted it first place. Make it glue less solution. Make it stronger that you could actually flame the macth using the matchbox as a medium to light the macth in front of the bow. Use knife to enlarge the hole and on bottom of the arc if needed.