The first improvement in print quality was achieved by upgrading Slic3r from 0.7.1 to 0.9.8. As described in my post of last January 17.
My first print was a glass from thingiverse. The foot printed fine. The stem was troublesome. I had to blow air (with my mouth) to get a reasonable quality.
|Left blown by mouth, middle with small 40 mm fan, on the right with big fan mounted in the printer frame|
|A fan is mounted on the printer frame using tie-wraps|
My printer has a 0.35 mm nozzle and I originally had the layer height set to 0.25 mm. You can set this value in Slic3r. I tried a value of 0.1 mm. Slic3r will do all calculations necessary to deliver the right amount of filament for the height and speed setting. The result was very smooth. Downside is the much longer print time.