compressed air i2 engine(almost works)

after several months of work, on this model alone, and working on similar concepts for years, i finally (almost) have it! an (almost) working, (almost) fully 3d printed compressed air engine! all it needs is a pencil(and mabey a hand/rubber band)! and all for the low, low price of about 60 grams of filimant, and hundreds of grams of filiment when trying to get it to work! sometime here i will get it working, and repost it, but i ran out of usable print timeI have spent way to much of my life trying to get this working before halloween though, so i probably will stop working on it for a whileyes that flywheel is neccisary(at least for a single cylender version that i gave up working on the day before yesterday)you probably do not have to use a pencil for graphite if you have better filiments or skills than i do, and evryone should have a pencil, so i am counting it as fully 3d printedsometimes the mechanism just needs a little working in, if you just rotate the piston in the piston hole