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This is something I made for myself for storing my pocket knifes in a drawer neatly, but they would work for other long/slender kinds of things or lots of small parts and such.

The lids snap into position, and will stay in place when inverted, but are not intended to be super secure for tossing into a bag or anything like that. Easy open, easy close. They stack and fit against each other side to side tightly because there are no external parts sticking out. I line mine with adhesive felt on the bottom, but that's obviously not necessary.

There are four sizes at this point. All are 25mm high and 40mm wide, but there are three length options: 106mm, 116mm, and 131mm. This is because some of my knives are a bit longer than the others. The 131mm long box is also available as an extra-wide 50mm design, because, you know, one of my pocket knives is pretty big.

I'll add more sizes later, I'm sure. And if your printer's tolerances are different than mine, or if your material is more/less flexible than mine, you might find the lids slightly too tight/loose for your liking. Increasing or decreasing the lid scale in your slicer by .2mm or so will probably be enough to fix things. You can always sand/cut down the bumps a little if they are too big, too. Just make sure you download the matching 131x50mm lid for that one.

If you add some adhesive felt to the bottom of them, as shown in three of the photos, they look nicer and will be gentler on the knives or whatever else you put in the boxes.

v1.02: added the 131x50x25mm larger box and matching lid.

v1.01: made the bumps on the lids protrude a bit more. Easy enough to cut/file/sand down if too tight, but impossible to make larger if too loose.