Some tweaks. Slight improvement.
First - tried lowering ninja flex temp. Anything under 225 results in a failed print. 225 seems to be a good temp. The ninja does ooze quit a bit though. Anything colder gets jammed up a few layers into the print. Still 225 results I’m happy with.
Next - lowered ic3d abs temp to 232. Improved slightly the thing is that the ooze guard results in small particles being dropped. These are then picked up by the nozel and moved onto model during other extruder movements. Most of the particles in the model come from this type of thing.
Finally - I increased retraction to 40. Not a very noticeable difference. Probably not worth the change.
I haven’t tried the wipe and prime tower. That’s my next tweak. Cura doesn’t have a wipe and coast option. Should I look to slic3r? I hear people say good things about it, but am comfortable with Cura. Does slic3r support the flexy dually?
The interesting things about all the prints. The imperfections are all in the same locations (except for the occasional fillament imperfection). The sloppy ninja side is near the ninja seem. The abs particles on the opposite side are about the T0 nozel distance away from that same seem.
What I’m not showing is the ninja abs shadow ooze. Basically the pattern of the abs center outside the model formed by the inactive extruder. Ninja likes to ooze. The ooze guard helps at keeping these away from the print. I cannot seem to address. Any cooler and ninja runs into extrude problems. Additional Retraction didn’t help. This isn’t an issue per say, but does need to be taken into consideration when modelling. I also think the quality would improve if the extruder changed more frequently. This model is basically to parts. (Tire and rim).
Pics show latest revision and all three revisions (excluding failed prints).