I made this mini crossbow just for fun so i can shoot at things with toothpicks. The springs used on my crossbow come frome a large spring from an old wind up clock wich had snapped. the wire used was just one I had lying around. The arrows are toothpicks. The dimensions of the mini crossbow are roughly 55mm by 42mm and 12mm high. All parts are printed with my HE 3D Reprap Prusa I3. The crossbow is entirely designed by me.
spring dimnsions are roughly :
more info about this project can be found here: https://hackaday.io/project/28562-mini-3d-printable-crossbow
video of this thing firing toothpicks can be found here (240 fps): https://www.youtube.com/watch?v=7QDyIyO7Lxw
All my project files, instructions, schematics, are provided for free so everyone around the world can enjoy them. Feel free to support me so I can create and share even more awsome projects. Any amount of support is greatly appreciated :-) paypal.me/BrianBrocken
Have a nice day!