There's this very weird idea that makes some people think that the maintainer must have a godawful workflow and if I just showed him the output of _my_ workflow, I can ~~save the day~~ fix a bug for them.
none of the printers mentioned going to meet any of your requirements.
Prusa isn't fully opensource, but has the worst enclosed chamber printer imo.
Bambu isn't open source in the slightest (beside the slicer).
You are never going to print PC on a bambu either way, at least not Pure PC. Blends, sure, you need at least 100c chambers for pure PC.
diy kits are the way to go, but it is going take you a LONG time. a voron, ratrig, or annex k3 are your best bets with the requirements you want. each kit has their weaknesses, and most of them, are going to require upgrades from their BOM.
Further improve XDM, XPath; achieve v3.1 compliance.
Add remaining v3.0 features to the XSLT engine.
NB. We're picking the low-hanging fruit first. So major, fundamental features of the languages are being implemented to begin with. The fine detail will be added later.
Although the eventual desire is to implement all of XSLT v3.0 functionality, some more advanced features will be implemented sooner rather than later.
https://hackerone.com/reports/2823554
Where the reporter says, "Sorry didnt mean to waste anyones time Badger, I thought you would be happy about this.".
People using LLMs think they are helping but in reality, they are not.