Bambu Lab recently announced a firmware security update for its printers that would introduce an official “authorization control” system for critical printer operations. The update is presented as a way to mitigate the “risk of remote hacks or printer exposure issues that have happened in the past, and also lower the risk of abnormal traffic or attacks.”
The new firmware will not allow Bambu Lab printers to interface with popular 3rd party software or hardware upgrades such as Orca Slicer or BigTreeTech’s Panda Touch screen. Now, users will need to download “Bambu Connect” to act as a one-way go-between.
there isn’t a “best” really. Depends on your wants/needs.
for true Openness, I don’t think anything beats a Voron.
Prusa is great (good track record, good support, Hardware is not open anymore though, can work out of the box), but expensive.
plenty of others get you something largely decent for low prices (qidi, creality for example) but long term support seems likely to lack, and there are always reports of some issues for some and great results for others.