Lid for 1 litre Bodum coffee press. I use it when making cold-brew coffee.
I've included the OpenSCAD file for easy customization if you have a slightly different model.
This is designed to be printed in a flexible material, I used TPU. Note that I wouldn't intend the TPU for food contact but I think it's ok just to keep air from circulating - particularly if you wash it hot enough to kill anything that might get into the gaps in the print - but you be the judge of your own materials.
This design is adjusted by a couple mm from the version I printed, which I think will give an even better fit.