I tried dual extrusion today and I have these oozing (or not oozing, you name it) in some places.
All the rest of the model is perfect except the spots I ruined accidentally :p
See images attached.
Sorry for the image quality.
Attachment 7157
Attachment 7158
Also, the printing seems to stop for a few seconds every time it finishes a layer just before advancing to 2nd extruder. Is this normal?
