by GreatExcelcior, published
The parts of a simple wedge catapult - base,catapult and trigger. The catapult is driven by an elastic wrapped around the wedge. This is a just an exercise I used to figure out how to use the shapesmith.net design tool. No idea what size this will print at. You need to make a couple of pivot dowels to fit the two holes, so if you can scale your prints, try to get the big pivot sized to a standard size of steel or aluminum rod.
My first 3D design. I don't have my printer fully built yet, so I don't know if it will print well or not.
The flingy part goes on top of a dowel sized to fit the large hole. it is held in solely by the elastic that you wrap around the indented part of the wedge and corresponding portion of the base. The ring on the trigger is so you can attach a piece of string... or maybe a trip wire. Cue evil laugh.