I’m not an expert in 3D printing but based on what you’ve written I can share some general ideas to help based on what I’ve seen from my own experiences.
For Smoother prints you could try:
Increase the # of Perimeters - Increasing the perimeters seemed to make it worse when I tried
Slow down your print speed - This would normally work, and probably would have netted a better result, but I’m impatient
Decrease your layer height - I’ve printed many things at this layer height and they never printed like this. I’m ruling out that as a cause because I can print another model well at this layer thickness.
For prints with low layer times (guessing from your image) Sometimes the fan helps with abs prints - Thats why I lowered the temps, I find the fan ends up cause de-lam in most cases with abs so I dropped the operating temps to get good adhesion without prolonging the setup time
Try using the Medium or FineABS print settings from lulzbot. Typically the slower the print the better the result. These settings also lower layer height and print speeds accordingly. - Using that setting on another print right now to see if it’s going to provide a better finish
Ensure your Filament extrusion widths are correct for the filament you have loaded. - The digital calipers never leave my side. I check those settings to obsession.
If you are willing to post your .STL File I would be more than happy to try and print it and show you the results with my settings to see if there is a significant change. - There are many changes as I was working with some settings to see what would stick in terms of changes.
I’ve modified the medium print setting from lulzbot to turn the fan on automatically with the following settings while printing small gears with descent success:
Enable Auto Cooling:
Fan Speed: Min 30 / Max 60 - I may try this setting, however the time between each stem of the object should allow for ample cooling time.
Bridge fan speed 100%
Disable fan for first 3 layers
Enable fan if layer print time below 30s - Interesting
Slow down if layer print time is below 5s - Also interesting
Min Print Speed 10mm/s
Also what percentage and type of infill are you using? I’ve heard people using concentric infill have had good success with circular parts printing better. 70% infil, and it was concentric, but oddly enough it did seem like it was doing concentric infill some of the time.
Lastly using an Acetone vapor bath provides and excellent smoothing and glossy finish to ABS parts if you have the patience to research a safe way to do it. - I’m planning to mess with this very soon, love the way it works.
Let me know if anything above helped and good luck printing!