A sturdy compact slingshot for 5mm OD rubber tubing.
For sturdy construction, print using 6 perimeters, 4 solid top and bottom layers, and 30% infill.
Smooth and clean the holes for the rubber tubings with a 13/64"(5mm) drill. The slots for installing the rubber tubings may need smoothing and cleaning with a fingernail file.
Rubber tubing and pouch kit can be purchased on ebay, or DIY.
Print and use at your own risk. Play safe and use eye protection.