I made this insert so I could have a die insert for my Magic the Gathering cards for the twistlock boxes, however it can be used for other things as well. If you want to use it for Magic the Gathering cards, I recommend the "Base_extra_large.stl" as base model. The width is wide enough to fit 100 cards in sleeves plus a sidedeck, so there should be enough space.
I admit, the lid just about fits on the box when the tray is in the box, so I recommend here in any case to take the "Long Latch.stl", otherwise the lid does not fit on the box.
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The author remixed this model.
I made an insert for these boxes