Hi Rudschul, colour of the powder is difficult to ascertain but it doesn't seem to discolour at all. I appreciate what you are saying about the warping and the difference in temperatures but I am using the default settings that Sintratec have set though I do realise these are only starting values. Heating up takes one hour forty five minutes and the chamber temperature is 140C and the surface temperature is 150C. When printing the surface temperature rises to 170C.

When sintering, the powder really does appear to melt and become molten rather than just fusing together. To me it suggests the laser needs speeding up but as I am at the very early stages of playing with this technology, I am open to suggestions.