Hello.

Needed a tallest top lid to allow better clearance for large heatsink, (scythe shuriken), the case has firm mounting, spend some time making test to achieve a good fitment. (You can see in the attached photos).

Print with 0.20 layer height, and add supports only on the small tabs. This was made to fit inside a prusa mk3s printer, if you has a printer that can fit in one piece, you are ready to go, if you need to fit on a prusa (one side has more 21cm of width....) you need to cut in two pieces.

Put the top lid straight and cut exactly on 209mm, you notice that I put nut traps and holes, you will need 3x m3x15 bolts with nuts, and 2x m3x12 bolts with nuts. See attached images for more information.

Use seam blocker to prevent seams on the faces that will be joined, I put two squares on one side if you want to put some glue, not needed (I actually don't use the glue).

Added a 3mf file with all of this done.

Printed with a prusa mk3s+, but some of the tests made with Artillery X1 with 0.6mm nozzle and 0.4mm layer height (the yellow pieces).