CMDMakerspace

I am experiencing some trouble with certain filament colours. The added images shows the problem, perhaps its called underextrusion..? The problem only occurs with the dark coloured PLA filaments, not with the light or fluor colours ones (these work fine). We tried to increase the temperature to 220 degrees and slower printing speeds, but this doesn't solve the problem. Can anyone tell me why this is happening? Thanks in advance!