Hi guys,

lately (no idea when it started) I've noticed that the corners of my ABS prints seem to have some little blobs on them. I have tried printing with different settings, but nothing seemed to help, so I'm getting a little bit desperate here now >.<.
Also, since the day I had used ABS for the first time I always had some small bubbles between / on my layers, however I've ignored that until now.

My printer is Makerfarm Prusa i3v with hexagon hot end (0.4 nozzle). I am using Cura as my slicing software

There are the settings I've tried when printing the cubes:
1:
  • Hot End: 225°C
  • Bed: 110°C
  • Print fan: on
  • retraction: 4 mm


3:
  • Hot End: 220°C
  • Bed: 110°C
  • Print fan: off
  • retraction: 2 mm


3:
  • Hot End: 215°C
  • Bed: 110°C
  • Print fan: off
  • retraction: 2 mm


here are the photos of those 3 prints, as you can see the corner blobs are present on all three:
2014-10-02 00.21.12.jpg

Bubbles between layers:
2014-10-02 00.20.47.jpg

I hope anyone can give me some advice on how to fix this