BB gun gearbox (Works, not a prop)

This is a project for a bigger printer, but i added all the parts in different files for smaller ones and this is just the mechanism for the bb gun, but if you put all the parts together the way i showed you it will work just not as well in PLA, but if you use like metal it's a lot stronger. I'm in 8th grade graduating into freshman year, and this is my biggest 3d printable model yet that is functional. I will be making more "things" later on that will be mechanical, not props. (I prefer "things