INDMATEC, a German materials innovation company, says the introduction of all metal hot-end extruders capable of attaining temperatures up to 400 degrees centrigrade have made it possible for them to create a PEEK filament for FDM printing applications. PEEK material is tough, strong, and rigid. The material features strong resistance to hydrolysis, can withstand boiling water and superheated steam and has a density at least 5 time less than most technical metals. It can be used for parts which must withstand heavy mechanical loads and it's approved by the FDA for food contact applications. You can read the whole story here: http://3dprint.com/52713/indmatec-pe...nting-filament

Below are some examples of objects 3D printed with PEEK on an FDM printer: