Updates

1. New Profile optimized for Bambu Lab's “TPU for AMS” filament. As described in my community post, I ended up testing over 30 different sizings (often 1/10th of a millimeter change for each iteration) and involving friends and family to help decide on the best fitting yet easiest to use sizes. For those that have this material, I'd recommend using the new profile.
2. Have updated the model slightly for all profiles (even the previous standard/generic TPU ones) to feature a slightly thicker thumb tab to make it more sturdy.

Thanks to my latest booster: user_3733637168. If you boosted me previously, scroll down to see your acknowledgment.

A slip-On Cap to Help Slow Carbonation Loss on Aluminum Cans

No supports needed and no (sparse) infill used.

I strongly suggest printing this with TPU. The flexibility of TPU offers a better seal and improved usability. Printing with harder filaments is not recommended if you want a good functional can lid.

Why this print is useful

Or family has someone who frequently opens a can of carbonated water, drinks part of it, then puts it back in the fridge. A few hours later, when she returns to finish it, it is invariably completely flat.

Made this simple cap to help slow down the carbonation / fizz loss.

This fits many different aluminum cans (some samples posted here). Soda, carbonated water, beer and many energy drinks.

Another downloader mentioned an additional great use: keeping insects out of people's drinks in an outdoor setting like a picnic. You've probably seen a picnic table full of open cans with bees, wasps or flies walking around on the top of the container and trying to get a little sip for themselves. This cover can keep that from happening.

Variations

Standard Fit

The “classic” fit. Not as airtight as the version below but is a little easier to take on and off. TPU seals better than harder plastics. Available with and without a “hook hole” - a small hole in the “pull tab” to allow for hanging on a small hook for organization.

Extra Tight Fit (Snug)

Added a version that a bit tighter. If you use this version, you will almost definitely want to use TPU if you weren't already planning to. If you do use PLA or PETG this one may not even fit on the can. Even with TPU, this version will be a bit more difficult to get onto the can then the standard fit. But it is more airtight and will seal better. Available with and without a hook hole. To remove easier, use your thumb and push up from below on the thumb tab.

Boosters 

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Bambu 3MF Notes

I have individual plates / 3MF for all four variants as well as a “sampler” if you want to print all four and then see which one you like best.

For the “Sampler” there are now 4 labeled plates showing which is which. Please note that the sampler profile has been optimized for regular TPU. If you intend to use “TPU for AMS”, please use the profile dedicated to that material for best results.