Thank you for your response, gr5.
I'm using 220 C... but right now I don't think there is an 'under extrusion' problem. I already printed out some small Yoda's head and a small cylindrical box and I didn't have any problem. Actually the quality was impressive!
What I noticed, the roughness in my box is noticable even in the software Cura (13.03) just after the slicing. In other words, the roughness is already saved in gcode!... so I don't think there is some problem with the printer. There must be a problem either with my settings in Cura or with my model... but I still don't know how to fix it...
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gr5 2,224
This is classic "under extrusion". You could be slipping in the feeder - maybe you could try tightening the feeder. More likely you can fix this with higher temp. What temp are you printing at?
Since this model has no stringing problems (for example if you had 2 vertical posts, you might get stringing between them) you could go up to 240C no problem. But later on other models you will get stringing so maybe just go up by 10C from whatever you are printing at now. Or slow things down a little bit to reduce the pressure in the print head.
See this also:
http://umforum.ultimaker.com/index.php?/topic/1763-bad-surface-on-printed-parts/?p=12318
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