All 3D print in place air engine single cylinder

This is a design from Printables by AEVW.
It is an amazing print in place air engine that really works.
It is a little tricky to print.
I sliced the stl that the maker posted and made it 200% scale, adding just a couple of supports and auto brims.
The brims are necessary to get past the halfway mark of printing it because the piston rod tends to come loose.
In my case it did come loose but only a little and the piston was able to print successfully.
Also I reduce the print speed on my A1 mini to 50% or silent mode. 
Using only an inexpensive electric air duster I was able to get it to run and did not need a compressor.

 

Here's a video of the engine working: 

Boost Me