C02 Gas Airsoft Grenade Charger Cap

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A buddy approached me to craft and print some caps to safeguard his CO2 gas refill units - and prevent them from discharging while in his pocket. I took a few measurements of the device, which accepts a standard 12g CO2 cartridge and features a straightforward valve and pressure gauge, then designed this uncomplicated cap (with a few added dimples for a more appealing look). The cap has a hole for inserting paracord or similar (4mm diameter) to allow the cap to be tied to the charger device. There are various versions available from different manufacturers, but the product I measured this design off of is this one: https://airsoftpro.cz/en/airsoft-guns/sniper-rifles/other-grenades/co2-plnicka-airsoftovych-granatu-s-manometrem-detail