Basic Catapult

Here is a simple but fully working basic catapult. Just add a rubberband over the top frame "hook" fasteners and around the backside of the arm itself.

You need the following pieces:

1x Main Frame
1x Arm
2x Strainer
2x Arm Plugs
1x Arm Plug Connector
4x Wheels
3x Shafts

-> The Arm fastens with the two Plugs in the center bottom of the Main Frame from either side. The Arm Plug Connector keeps the Plugs together.
-> The 3 Shafts are for the two wheel axles and the Strainer. These are glued into place (wheels/strainer+shafts only) and should be able to be able to turn in their resp holes.
-> You can add a piece of string to the arm hook going down to the Strainer Shaft to be able to "load back" the catapult realistically.
-> Everything should be able to be printed without any support, except for the Strainer piece that would need something for the pulleys.

Good luck and have fun! :-)