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Building a custom shaped Compressed air tank

Hello, am looking into the possibility of building my own paintball markers, and wanted to do a custom way of using the air system, compared to most markers. I was thinking either a square shape, but after finding an article that was talking about water and gases tanks and why they are build cylindrical, i realized that maybe that might not be as easy or practical. another possible idea would be a flask shaped tank, but for the design am looking at it would need special commendations, none the less I wish to see if something like that could be possible.

Toga_Dan26 days ago

https://en.m.wikipedia.org/wiki/Girandoni_air_rifle

I'd not recommend fabricating your own unless you are an excellent welder.

It all depends on the pressure but considering just the levels of a basic paintball system....
No matter where you look, all high pressure tanks come down to a very basic shape - the typical cylinder.
Once you have edges and flat reas the forces acting on them are so high that safety becomes a really issue.