Two cylinder Air Engine

I took https://www.thingiverse.com/thing:7908 and heavily modified it into this, it sorta works but idk what a good psi to run it at, all you'll need is
2x M3 grub screw
3x M3 12 mm screws
Note: SOME files will need to be scaled down to 10% in your slicer, it may be obvious but because some of the original parts were made using cm not mm it scales weird.
also to mount the con rods I'd melt the two ends around the crankshaft together with a soldering iron, make sure not to melt it to the crankshaft.
If Someone makes this thing work, please link this to the thingiverse page of a working one