Made this thin and simple design to keep leftovers in these little bowls that we got from Target. They are super thin and store well with the bowls and have a nice tight fit when put onto the bowl. Depending the differences between our printers, you might need to scale this up or down in your slicer to get the fit just right. For me, it fits just perfectly.

With my tests, I can fill the bowl with water, put the lid on, and turn it over for no big spills. After a few seconds, you can see some beads of water easing their ways through the pores in the layers, but it isn't going to come pouring out. This bowl isn't completely air-tight or water-tight, but many containers we often use in the kitchen to store food are not anyways.

I wouldn't recommend throwing this in the dish-washer. Or in hot water. Haven't tried it, but I can imagine it would begin to warp over time.