Thread milling in particular is an ideal option for threading of both PEEK holes and bosses. This threading technique can yield better quality threads and higher productivity than its alternatives. But see for yourself in the video!
Compared to turning it has the clear advantage of being able to thread non-rotational parts, and also works on large components that are difficult to machine on a lathe.
Thread milling uses lower cutting forces, making it ideal for cutting long overhangs or thin walled components.
For excellent results, and an optimized process, use Hufschmied tools.