In skeinforge you can do it tunning Retraction in Dimension.
I'm still gcoding with RepSnapper (cant tune all the options on skeinforge to get the same result yet), so i just tune feed rate and and Extruder STU to minimize it.
looooooooool that is waht i get for reading posts 5 min after i'm out of bed
Cat fur gives the part more strenght!
PLA is a bio material, it just got more bio!