3D printed weapons are a contentious issue, but most are meant for more harmless activities and hobbies, rather than any intent of harm. Items such as slingbows -- a cross between a slingshot and a bow -- fall into this latter category, and Raymus Munt has never shied away from a challenge. When his friend showed him a slingbow, Munt decided to create his own version for his friend, and set about complicated design work. Based on a design from the Slingshot channel's Jörg Sprave, the Rambone, Munt reworked the original STL files in Autodesk Maya and Mudbox, adding other features he thought would work well, and ultimately made his own "Slingbone." 3D printed on his Wanhao Duplicator 4, and including a few non-3D-printed parts, the Slingbone is a highly accurate and very powerful bow, with files now available on Thingiverse. For video of Munt's Slingbone in action, as well as more details about its creation, check out the full article: http://3dprint.com/56021/3d-printed-slingbow/
Below is a photo of the Slingbone: