For assembly instructions see the original upload
https://www.prusaprinters.org/prints/31558-big-einsy-case
Instead of the nuts and square nuts you will need
Hole diameter for insert is 4mm.
I modified both the original and a mmu version.
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Also checkout my other Big Einsy case
https://www.printables.com/model/193810-big-einsy-case-with-inserts-and-cable-exiting-vert
The author remixed this model.