Funny enough, through a confluence of circumstances, we ended up making slingshots without ever properly introducing them. Things all got started when one of our members, a long time entheusiast, decided he wanted to design and 3D print himself a Bill Hays Harpy. A little strength and safety testing later (the slingshot failed at 344 pounds force) and other people started wanting them. This turned into a secret menu on our website devoted just to slingshots. Eventually, when we were ready, we made this public; a whole new category of product.
What started with a single design quickly blossomed into our biggest product range. Slingshots allow for an incredible diversity of materials and shapes, so this really is a playground for us to play with design.