This simple disc launcher prints quickly and easily in a fun kit card format. Just snap a disc into place and the launch it by pushing it forward through the gap in the fork. It flies surprisingly far! I've also included a plate with the separate parts if you want to print them separately, or for when you (inevitably) lose the discs.

Assembly
The launcher consists of just 3 parts: the springy launching fork, the two-fingered grip, and the thumb pusher. To assemble, first put the pusher piece over the grip as shown in the 2nd photo. Then tilt the fork into the rear hook as shown in the 3rd photo. Finally, just snap the fork flat, locked into place by the front hook as shown in the 4th photo.

To load the disc, pull the plunger all the way back with your thumb, and then tilt the leading edge of the disc into the front inside edge of the fork as shown in the 5th photo. Then push it flat against the backstop on the plunger as shown in the last photo. Now you're ready to launch!

Credit: There are a bunch of similar disc launchers, but the earliest design I could find of this type was from davedelay on Thingiverse. Let me know if you know of an earlier version.