Near the bolt holes joining the two halves, you can see thin strips going across that overhang gap. Those eliminate local sagging without needing support material. The part could have been flipped 180 instead, but then the outer edge rim would be unsupported.

Puzzles (40 single-player logic games) I recommend this package on f-droid for puzzles. As for an organised list, f-droid is pretty lacking in terms of subcategories within it's categories, but I have skimmed that whole category a couple times just to see if anything is interesting. There is also a solitaire package in there. Simple Solitaire Collection (Solitaire game collection with 17 games)

The monoblock was a prototype watercooling block that interfaced with the cpu and gpu simultaneously. Normally if you wanted to watercool both components one would purchase seperate waterblocks for the cpu and gpu and then use plumbing in between the two.