I've designed an improved air nozzle for my 3D printer. I've tested the design already with PLA, but over time the nozzle tip sags due to its proximity to the print head. So, I'd like to have it professionally printed in a material that is more heat-resistant. I'd like to avoid the ceramic and metal prints because they're heavy and expensive. So, among the plastic options on Shapeways, what's my best bet? What can handle being within less than a centimetre of a 200 degree hot-end?