I bought bottles of sparkling cider to celebrate Thanksgiving, opened one, had some, and wanted to put the bottle back in the fridge for later. But Martinelli's no longer ships with a plastic cap, and I had no wine corks.

I had just watched the Maker’s Muse video https://www.youtube.com/watch?v=iWZw7RO2Sks [20 min] on printing with flexible filament, so I used his tips, and printed a working cider bottle stopper in TPU.

Be sure to use a release agent. I used a layer of glue stick. TPU really wants to stick to the build plate!

And yes, it does solidly stopper the bottle.