Fun little projectile thrower. Requires a round toothpick and a rubber band. Print with support for the cross-beam.

Creality

Ender 3

Yes

Yes

0.2

To assemble
Press wheels into the larger holes. Make sure you press square and even so the axles on the wheels don't break.
Double over the elastic band twice then stretch it around the tower.
Insert the bottom of the throwing arm between the elastic and the cross-beam
Pinch and pull the rear half of the rubber band down. Then pry the throwing arm up and pull the part of the band you're holding over the end.
Insert a toothpick through the holes on the frame and the throwing arm, then cut off the excess with clippers. Leave a little bit of the toothpick sticking out of the frame so you can adjust it if it moves over time.