Slingshot Split
thingiverse
Original thing was very curvy. I suspect that was why folks had a hard time with it. I split it, printed it with 80% infill using ABS, then stuck them together with industrial glue (or Super Glue would work). I had to cut grooves to insert my rubber band. I use this to launch the awesome gliders you can make off Thingiverse! :)
Download Model from thingiverse
With this file you will be able to print Slingshot Split 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 Split.