Today I tried to print thing 27405 from thingiverse (http://www.thingiverse.com/thing:27405) on the PrusaMendel in the CCCZH lab.
The result is shown in the provided image.
After some tweaking of temperatures and speed I finally managed to make it print perfectly!
While bigger objects still are producing some strings when it’s going to the end, smaller objects are printing fine now.
Turning the temperature to 190°C for the first layer and 185°C for all the other layers, and also reducing the extruder multiplier down to 1.0 made all problems go away. Finally!
Now I just have to figure out how to make Slic3r in ReplicatorG do support material.