This is a simple case for partial sheets of blister pack chewing gum. 

While working off a nicotine dependency I used Nicorette gum, which comes in boxes that have multiple blister pack sheets but no case. My keys kept mangling the gum in my pocket, making a mess and wasting expensive gum. I tried using standard cardboard gum sleeves that come on other store bought gum but they didn't last. I also found I don't need to carry a whole sheet of gum, just a few pieces at a time. I needed a smaller case that would last longer, not give in to the keys in my pocket, not look shabby after a few days, and maybe even have a little style or class.

I modelled up a simple case in Fusion360 using my very basic CAD skills. The result worked out pretty well for me. Maybe it will for you too.

Gum comes in sheets of 3 x 5, an unfortunately odd number. I trimmed off strips of 3x2 and nicked off the prickly corners for use in the printed case. The leftover 3x1 strip stayed on my desk. I tried a 3x3 case but didn't like the extra size in my pocket. 

I printed vertically with a brim to get a nice smooth finish. I tried standard settings with PLA and a vase mode version in clear PETG, my personal favourite.

I posted some pictures of a 3x3 in Eryone Tri-colour Silk PLA and an Overture clear PETG vase mode print. The PETG print in a couple months old and well used, even developing a crack now, but all I have to share for pics. For the clear PETG, I experimented with the Bambu Lab recommended settings for printing clear, slower and hotter. It worked well enough to read the gum pack through the case.