Sigg Thermo Flask Cap
thingiverse
The original cap is hard to clean and leaky. Designed this as a simpler replacement. Accepts the same gasket as the original cap. Disclaimer: 3d-printed parts, even in traditionally food safe plastics like PETG, are not food-safe since they offer many tiny crevices for bacteria to grow that are impossible to clean. I used food-safe epoxy to thoroughly coat and waterproof the entire part. I hope that made my cap safe, but I make no claims about the food safety of this design! (further reading here: https://hackaday.com/2017/10/17/3d-prints-and-food/)
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