The website literature indicates that additional accessories are needed to print with poly-carbonate or nylon. What are these accessories?
Also, Garolite sheet from McMaster 8525K112 is only $7.30. I see no reason to purchase the more expensive machinable version.
Why use PEEK in the nozzle? Is there a suitable alternative that will allow higher melt temps for nylon 645? Does it really need to be made from a polymer? why not carbon or non ferrous metal?