Are you using Marlin?
Are you belts properly tensioned?
Temperature can be lower, which might help.
100% infill will require perfect calibration. Try 90% infill so if you have a bit of over extrusion it will flow out during the infill and not during the outer edge. Most likely you have a pressure buildup which starts to cause extra extrusion around 1cm of height.
This fan shroud does wonders for small objects:
http://www.thingiverse.com/thing:10501
I printed these:
http://daid.eu/~daid/IMG_20110921 ... small.jpeg
and they look perfect. But they where at 20% infill.
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ddurant 0
That looks pretty small on X/Y, which means heat management is going to be a real hassle. Print slower, print cooler, put a fan in front of the machine to help cool it. If you're using skienforge, try using Multiply and printing multiple copies at once..
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