I have now gone through a rabbit hole and managed to make the surface finish way better. I am not sure however if i have fixed the actual issue. But i will go through my findings here. And hopefully any other people with the same issue can try my steps
I also re tightened the X and Y axis belts with no changes to the ABS print quality. And i also tested PLA and PETG which printed perfectly.
These pictures show the before and after. (Its hard to take pictures showing the results, but belive me the changes are huge)
STEP ONE: SMALL BUT VISIBLE IMPACT
My first step was to change the 0.4mm nozzle with the spare one. Fyi - the printer has only ran for about 140hours at this point printing mostly PETG from Azurefilm.
When trying to change the left nozzle it was stuck. Searching the forums i found more people with the same issue. Check the link for more infor
And behold i had the same issue. Some goo that was stuck between the nozzle and the heater.
Switching nozzle had a small but visual impact. What i saw was that the new nozzle heated to the target temp way quicker. So my theory is that the goo disturbed the temperature sensor making the nozzle print hotter than it was supposed to.
STEP TWO: MEDIUM VISIBLE IMPACT:
In step two i recalibrated the filament flow rate, max flowrate and temperature
These are the settings i changed on the Bambu Lab ABS filament.
- 0.975 Flow rate
- Max flowrate 20mm2 (Unchangedc could go higher, but did not want more variables then testing)
- First layer temp 265, then 260 for the rest of the print
- Slow printing down for better layer cooling “ON”
- Dont slow down outer walls “ON”
The new filament profile had a visual impact, but it was still far from good enough.
STEP THREE: MAJOR VISUAL IMPACT
When doing the max flow calibration i noticed that from 5mm2 to 25mm2 i saw none of the visual artifacts i was used to.
But this calibration has almost no changes in acceleration and sharp corners. So from this i deducted that the acceleration settings must be whats causing the majority of the artefacts.
And behold it was. After keeping the original print settings as shown at the start of this forum post with the new nozzle and calibrated filament. Reducing the acceleration alot “fixed” the rest of the problem.
Outer Wall down from 5000 to 2500mm acceleration
Inner wall down from 8000 to 6000mm acceleration
My theory is that the viscosity of the Bambulab ABS filament cannot handle the jerk and acceleration as good as the PLA and PETG i have tested.
CONCLUSION:
I don’t want to use more time troubleshooting. The result is not perfect but good enough for me.
But reducing the acceleration not speed is what had the biggest impact on the quality.
Important notice! I have only one spool of Black ABS, it might be that i have gotten a bad one.
Hopefully this helps someone else with their problem or further troubleshooting.