Dude, it's a Frisbee gun that shoots tiny printed discs without any wrist action! Made totally of 3D printed parts. This edition is a single color model that can shoot discs up to 20 yards.Use a double wall for all parts. The discs could be done with one wall if you want. I'd suggest about 35% infill (ABS experience) for the catapult (spring). The H-3 support file can be used if you want to build the handle upside down with a relatively sparse water soluble support. It's purpose is to provide full support on strategic areas for proper gun function. If you want to buy one go the the makexyz website store.