[trouble with material flow?]

hi,

I have some trouble with my ultimaker 2.

when i set the bottom layer to 0.1mm i get gaps in what should be solid.

see image attached.

when i set it to 0,3mm it works fine.

bottom speed is 15mm/s so not vast.

material is PLA

Any ideas?

looks like material flow is not enough or is there a known issue with cura v15.02.1 ?

thanks,