Seems that no printing 'factory' is able to fullfil my requirements of 0.3mm thickness in certain part of the TOH, bezel around the display.
(except shapeways frosted plastic Ultra detail which is $$$) (And my own printer)

Summary of wall thicknesses with reasonable priced coloured materials;

• Sculpteo 0.5mm
• Shapeways 0.7mm
• i.materialise 0.8mm

I have contacted now couple of local suppliers here in Finland, lets see what they can do.

(same issue is then with eink/epaper TOH too, so finding good supplier now makes life easier in future)