Slingshot
thingiverse
Things You Will Need: Rubber bands: https://www.amazon.com/dp/B0796QXHCG/ref=as_li_ss_til?tag=hobby%2D21&camp=0&creative=0&linkCode=ul3&ascsubtag=plastic+model+rubber+bands M3x20 Screws (4) M3 Square Nuts (4) M3 Washers (4) PLA is a bit too brittle for the slingshot. I used Green-Tec, but ABS would also work just as well.
Download Model from thingiverse
With this file you will be able to print Slingshot with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Slingshot.