strange problem with small piece

[simmosam 0]

Hello,

since a month I'm printing and with good success. Since I still have problems with plugs (even with Hotend V2.0!) I wanted to print the Bertho extruder update. I can print nearly all the parts but the Yoke part gives me a headache! One leg of this part is ok, but the other (right leg) won't print well, it seems that there's too much material for this. I print with the standard Cura parameters with 0.1 layer height. the parameter for extrusion i needed to adjust (100mm extruded was only 95mm measured; param adjusted to 867.xxxxxx)

The problem als occur when I tried to print Z_axis_long_body from http://www.thingiverse.com/thing:19912 th four islands are totally crap, it looks to me that these are being made with too much material.

Any Idea what is wrong?

Greetings,

Sam