Europe's biggest 3D-printed building rises in just 140 hours

Probably Linux.

Just like any other data center, except for the curved walls, maybe.

I would imagine you could "cut" out windows since it's all cement with rebar inside.

Here's another article, with a photo from the inside and a video of the construction process.

https://www.techeblog.com/the-wave-house-data-center-europe-largest-3d-printed-building/

That said, I'd expect racks and blinkenlights, it's a datacenter after all.

The whole print process video is embedded in the article... https://www.youtube.com/watch?v=cfWryED7Zrk It really is just a big 3D printer. At first i thought the walls were like 90% air with no infill but it looks like they fill them up with rebar and cement. So really its just a thing that prints unique molds to pour concrete into so not really "a 3D printed building"

From what I understand (based on smaller printed buildings anyway) it's identical to FDM 3d printing pretty much, except that instead of filament, a massive onsite silo contains a liquefied cement-like mixture. The nozzle also has a valve of some sort to immediately stop flow.

Typically one operator has a computer running the printer host software, and others manually fix-up print errors (and things like blobs) while the mixture is still damp. A paperclip shaped rebar is also inserted into the walls every few layers for additional structural integrity

There are challenges with things like rainfall retention in walls during construction, but various companies have their own way of dealing with that from what I understand...

Due to the mixture it's usually restricted to walls AFAICT. Overhangs like doorways need beam supports to be inserted into the structure beforehand