Did finally some more testing with the 3dktop.
Printed a couple of real things and one of them is a new shroud for the partcooler.
Print settings were :
0,2mm layers (of course with the 0,6mm nozzle )
260°C hot end
Cooling : fan at 33% from layer 10 on
Printer closed (No extra insulation, just 3mm of clear PC around)
Printing speed 100mm/s
Brim : 10 outlines to have a larger surface on the glass
Adhesion : 3Dlac spray (kind of hairspray for printers)
The print went extremely well and smooth.
The result is a glossy surface.
Let the print cool down on the bed to get rid of internal tensions
The print was already quite hard like PLA
After that 1 hour in an oven at 110°C to make it more chrystalline and to give it its final properties.
I didn't see any difference, but as it is mounted now at 5mm from the hot end even after sitting 1 hour next to the hotend at 240°C and without fan it is still solid.
Looks ok for me.