Compressed Air Engine

Who knew that 3D printed parts could be made to such tight tolerances! I'm very new to experimenting with ABS acetone smoothing, so this was a great project to start with! STL files are available to my Patreon supporters:
3D Printer settings:
Nozzle diameter - 0.2mm
Filament diameter - 1.75mm
Extrusion width - 0.25mm
Layer height - 0.1mm
Top solid layers - 6
Bottom solid layers - 6
Side walls - 6
Outline direction - Outside-In
Infill - 25% (honeycomb)
Material - ABS
Nozzle temperature - 240C
Bed temperature - 60C
Cooling - OFF
Printing speed - 1800mm/minute (Correction from video)
Other parts required:
1pcs Spring (outside dia: 3.18mm, free length: 12.7mm, wire dia: 0.51mm)
1pcs M4x30mm bolt (this can be any desired length)
3pcs M2x20mm bolts
1pc M2x bolt
2pcs 604-ZZ bearings
2pcs 3mm brass collars (these can be cut from brass tubing with inside diameter of 2mm and outside diameter of 3mm)
8mm inside diameter PVC tubing (for air supply)
A propeller of some sort will also be required, probably something around 5-8 inches in diameter will do the job.
Disclaimer: If you wish you 3D print this engine, do so at your own risk. Working with high pressure air is DANGEROUS and I hold no responsibility for your actions. All parts were printed to the highest strength possible and I can't guarantee that your parts will be the same. So please test the engine behind a protective cover and only to low pressures below 30psi.
Sponsored by 3D Printz UK: /
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