We’ve gotten really, really good at extracting energy from steam, steam turbines can be incredibly efficient, I can’t recall exact figures but Wikipedia cites 90% as the top end.

I haven’t looked at Nix in detail but you got me interested for 3d printers in particular, already have my klipper config in git if an SD card fails on me, going to have to look at doing that for the os too.

I can’t comment on the other ones unfortunately, but there are a ton of mods available for Vorons that are still coming out. They’re solid platforms and great if you’re someone who likes to tinker, imo they’re also super solid as “just print” device. I’ve got mine with canbus and built a filament changer, but there’s tool changer mods I’ve seen as well.

If you do go for a voron, I’d suggest a trident. I have a 2.4 but I recently built a fixed gantry printer like how the trident is setup, it’s a lot easier to work with.