Hi all,

I am an owner of a Wanhao Duplicator 4. For a project I make a model with a flat horizontal surface of 6mm thick. I tried first a little piece of 50x50x6mm and this was the result:
WP_20141028_006.jpg
WP_20141028_007.jpg

The first image is the top, it has holes and isn't quite well. The second image is the bottom, which I think is perfect. How can I improve the top?

My setup:
Wanhao Duplicator 4
Black PLA
nozzle temp: 195 C
bed temp: 50 C
Shells: 3
infill: 15%
Speed: 60-80

Thanks for your responses in advance!
Oscar