are you saying that you want to 3D print parts that can hold screws in 3D printed threads? If so, there is more than just the temp resistance and resolution to think about…
I would worry about the ability of any plastic to hold screws with any strength without metal inserts. I would be twice as worried about the strength and reliability of 3D printed screw threads made on a consumer desktop device.
Most of the 3D printed parts I have seen from small consumer devices have a texture finish that requires sanding or surfacing products. Maybe it would be better to drill and tap the parts manually after printing instead of printing screw threads.
There are some consumer desktop devices that can 3D print with a carbon fiber filament. Perhaps this will give you the strength and temp resistance you need.
Have you considered a subtractive process instead? Low cost desktop CNC routers capable of making 12" x 12" parts with a quality finish and out of strong materials are more readily available than 3D printers with the same capability. Just a thought.
A CNC router would give you a lot more options for high temp resistant materials. Parts could be milled from wood, tooling board, resin blocks or even aluminum. The cheap 4-axis devices on eBay are not the best but if 3D print quality was good enough, then the quality from a cheap CNC router should be more than sufficient.
I don’t know what your budget is but for me, if given the choice between a sub $1,000 CNC router or a sub-$1,000 3D printer, the router wins every time.
