You can totally go 250km/h on the A5 from Frankfurt to Darmstadt, if traffic allows it. That wont always be possible, but typically if it isnt during work traffic, 160-200km/h is doable comfortably, even on other parts of the Autobahn

The longest unrestricted part that ive driven should be the A71, where you can go longer passages without restrictions, save for the tunnels.

Which happens with most engines. UE5 is an update version of UE4 and so on.

Tbh, it would probably be one of the opensource diy printers like voron, jubilee or annex.

The instructions on the Web are pretty good, unless you start messing with Tons of mods, but thats your own fault.