Hi rudschul,

I am seeing similar results. The more parts there are to print, the more difficult it is to remove the powder. I am pretty sure the reason is that the laser is adding to the surface temperature to such an extent it takes it just past the optimum. For single, small parts I set the temperature to 174.6C but for the occasions I print many parts at once I set the temperature to 172.4C. I have not yet tried experimenting with the laser speed too much but it looks like you may be getting close to something that works. Now we need to make a sliding scale of temperature and speed against volume to be sintered.