A German based firm finally got us PEEK for FDM printing. See here 3ders.org - INDMATEC's revolutionary PEEK filament now compatible with FDM 3D printers | 3D Printer News & 3D Printing News

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how they have solved the bed adesion problem of peek?

There are 2 acceptable solutions to the adhesion problem: (i) print on a well structured surface / substrate / heating bed and (ii) disperse a half millimeter layer of ultra strong hair spray followed by an incremental heating of the bed for each 200 micrometer PEEK layer deposited over the temperature range 85 deg C and 95 deg. C. It would greatly help to minimize the temperature gradient across the volume of part being built-up. Cheers!