An Engine meant to work with compressed Air. Easily 3D printable and requires minimal assembly and sanding. It is meant to work with a ball pump needle, two bearings from a 3D printer stepper motor, and a generic bearing from a 3D printer. I was able to get at most 700 RPM before failure.

Assembly:

1. Print all the parts.
2. Sand the piston a tiny bit so that it slides in the shaft with minimal friction but does not allow air to leak (lubricate if necessary).
3. Insert the ball pump needle into the hole on the mount.
4. Finish Pressing in Bearings and assembling the Engine
5. Apply at least 15 PSI to run

Video: https://youtube.com/shorts/lJXUyBf6vjo?feature=share