Small Vacuum/Air powered engine

This small engine runs absolutely great for me, this can be powered by a regular vacuum(Tip: make sure its not a weak vacuum). After assembling the engine, I recommend supergluing the top and bottom piece, be careful not to get in on the crankshaft itself. This should spin smoothly, and be able to make a few rotations easily. I recommend printing with 30% plus infill and 1mm thick walls. I am open to suggestion, please and thank you! Check out my V2 version now!