High Temp Filament that can consisitenly take 270 degrees Celsius?

[curious aardvark]

well if peek won't do the job then you need to switch from fdm to a resin machine.
But even formlabs hi-temp resin is only good to 238c
https://formlabs.com/uk/blog/high-te...y-3d-printing/

You might have to start thinking metal :-)

https://xactmetal.com/xm200c/

Yeah it's a 'little' more expensive - but Oh so COOL !