These are the lids for the Big Ant crates. These crates can be purchased at Amazon, fold down, hold an enormous amount of weight, and are 395mm x 295mm, almost exactly the same size as a Systainer M.
The top of the lid - the black “Anti-Cleats” are 3D printed, while a CNC was used to cut the pockets for the anti-cleats and cut the outside edges. The anti-cleats here make it so that Systainers can be stacked (but not locked - yet) on top of the crates in a very secure way.
The bottom of the Big Ant lids, a CNC was used to cut the edges here, making it so the lid nestles onto the top of the crate.
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