Bad calibration cubes and running out of ideas

[HoloPuff]

My cubes are really bad and I don't know what to do anymore.

Printer: V2.4 LDO 350mm with Revo 0.4mm nozzle, StealthBurner, Tap
Max acceleration set to 3000
Extruder rotation_distance has been calibrated and verified

Material: ABS (AMZ3D) gray
Left Cube: nozzle=240c, extrusion multiplier=1, cooling fan = 50%
Right Cube: nozzle=230c, extrusion multiplier=0.9, cooling fan = 100%

I also tried 250c and it looks the same. The bridge inside the cube is also really bad and came out as pretty much a blob.
What now? I've been meeting around with this printer for months. Replaced most of the printed parts, upgraded to tap and canbus, made sure everything is tight, gantry is squared, I can get a decent cube

Do I replace the hotend? I'm getting really discouraged here.

 

[Yezariael]

I would start wtih hardware and doublecheck if everything is tight, all the grub screws and belts okay. Then, did you follow the Tuning Guide step by step?

 

[claudermilk]

I just finished re-calibrating my printer after things went sideways and my cubes looked something like yours. I checked all the bolts again, even though I was pretty sure they were tight; I found a couple that might have been a bit loose and that resolved my Z wobble artifacts. I also threw out all my slicer settings and started from scratch with the Andrew Ellis ones as a baseline then ran through his calibration routine again. Now the printer is working beautifully.

 

[VACInc]

I was seeing similar issues. A few things drastically rectified my issues (or at least a lot of them):
- Set proper pressure advance (did this using orca slicer's pressure advance calibration test print)
- Enable input shaper. Apparently I ran and saved input shaper calibration...but it wasn't actually enabled in my config via the [input_shaper] block being present.
- Properly tension belts -- not sure how much this one really helped me but I tensioned my belts using the gates app

 

[Sanity Agathion]

This looks weird... looks more like slicer or extrusion issues. Does the fan really blow? It looks a bit undercooled. Or alternatively bad PA setting.

 

[Outsider]

Doesn't ABS want little to no part cooling? Though the cubes don't look warped.
Heated bed helps too, didn't see any mention of it.
240°C first layer, 230°C for rest and 105°C bed, 20% cooling fan seems to be working for me with eSun ABS+ (my V2 parts on a Prusa 3).

 

[claudermilk]

Doesn't ABS want little to no part cooling? Though the cubes don't look warped.

Ellis addresses that.

 

[NoGuru]

ABS does require cooling, depending on your fans and ducting, 20%-60% is pretty average.

Sanity mention this, try a different slicer.
Something looks off with the settings.
Also your cooling looks bad. What Hotend is this and what fans are you running?