This is a remix of Desktop Stomp Rocket & Glider - Angled Launcher
by LoboCNC [https://www.thingiverse.com/thing:5228007]. I made this in OpenSCAD for easy customization.

This prints well on a Prusa Mini. If the tolerance is too loose / tight, adjust the value of "space" accordingly. A slightly too loose problem can be fixed by adding a layer or two of translucent tape.