NOTE: Fusion360 Crashed Before I saved it to cloud so now changes will be harder without source
No Screws needed. All you need is a 3D Printer and glue. Glue each side together. (Not the moving parts) Slot in the dowels. Load a band on the back, and shoot!
I made this cos my old rubber band gun broke and I wanted to make something :D
Sadly the back bits need supports so place all bits with half facing down (Like in image(But with diff sides ofc))
On Ender 3 U can print all but 1 piece at the same time
IT IS 2 DIFFERENT PARTS COS MY FRIEND WANTED EACH SIDE A DIFFERENT COLOUR SORRY FOR ANY INCONVENIENCE
If tolerances are too tight then dip the dowels into boiling water for a few seconds (WITH TONGS!!) and then press them in.