Gas Cap - closed - 1-3/8in mouth
thingiverse
A threaded cover for plastic fuel containers. The opening measures 1-3/8 inches in diameter. The threading has four threads per inch. I designed this using Tinkercad: https://www.tinkercad.com/things/fbtKLLHE4eY I printed it with PETG, but commercial-grade caps are usually made of ABS. I'm not sure how different materials hold up to fuel. I'm no chemist. Use at your own risk. The open collar gas caps degrade after about one year when printed with PETG. I don't know how the closed cap will fare. I think the problem is that my fuel can doesn't have a second vent, so the pressure of the fuel vapor weakens the material. ABS shouldn't experience this issue.
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