Thanks so much for your reply! I use ABS from two suppliers: Lulzbot and an american ebay vendor that sells filament from china. I was very skeptical of the chinese filament at first. But I took the entire roll off the spool and measured its diameter and eccentricity at about 30 points throughout the length. It is a very consistent 2.89 +/- 0.015 mm. I did the same for the Lulzbot, which just barely bests it at 2.85 +/- a fat 0.01 mm. I also noticed that the Lulzbot filament pops and snaps more than the chinese one (I keep all my open filament in a sealed tub with dry rite). I set the filament diameter in the slicing software every time.
I just double checked my extruder steps/mm setting and found that it’s _under_extruding by about 2%. I think I just let that go when I first got the printer. But from now on I’ll make sure I’ve got that right.
I haven’t changed the acceleration: Accel: 500, Amax x: 9000, Amax y: 9000
The example prints in my first message were with the chinese filament (all the blue examples). Here are some more examples from the same filament (much higher res images are available in this gallery).
The Make overhang test:
The same parts, just flipped over (70 degrees is at the bottom):
Now compare them to the Lulzbot filament:
And the same parts flipped:
Aside from the overall increase in gloppiness, you can still see that the corners present a special problem. I see it the 3rd and 4th pieces, near the top (30 and 45 degrees).
Clearly I do not have the hang of this yet, and that’s why I’m here asking for help. I’m hoping someone can just say something like “You dope! You’ve got the _____ set too ____!”
Any and all advice is greatly appreciated!