My son has this HotWheels®️ track that has a spring with a spring that has a key to arm it.

At some point the key snapped so I printed a replacement, which I am sharing with the world here.

The original key had this small notches on the sides to fix the key in the launcher. I didn't like this feature because it made it impossible to disassemble the track to make it flat again.

If you still need the notches see the _notches file.

Used 5 walls, but 3 should be fine as well.

Orientation as in the stl.

Creality

Ender 3

No

No

0.15

50%