Why is my print getting messed up mid-print? I am using Slic3r to generate the GCode for my Marlin-based printer. For some reason with increasing height my print starts to get messed up. On another part it starts to act like this when there are small parts. Is this related to my Slic3r settings, maybe to much filament being extruded or is this due to something else?

Any help is highly appreciated and I can provide more pictures of messed up parts or slic3r config if necessary.
For me, this looks like a cooling problem. Try to print this part 2-4 times in one print and get sure your fan is cooling all the time.

It is a known problem, if the layers get smaller, that they do not have time to cool down. So you're printing on a wobbling bunch of still soft layers, which result in what you showed on the photo.

In my opinion, this has nothing to do with the filamen.