Crossbows aren’t really used much anymore, having been supplanted by the gun, but they are still used in shooting sports and recreational hunting.
Although this mini-crossbow is too small for taking out zombie hordes, it’s impressive in that it has been 3D printed in one single piece. All that is needed is a string that is glued to the bow’s arms.
Designed and printed in a day by Chris from trenchphysics.com the crossbow features a pull-trigger that uses the plastic as a spring. It’s printed in ABS and Chris had to print support material using Slic3r set to a rectilinear pattern with 2.5mm spacing with a 5 degree rotational offset.
Download the files from Thingyverse and prepare for armageddon.