Odd Artifacts on bottom few layers of vase print ABS part

[Jdo300 0]

Hello All,

 

I've been working on optimizing an ABS profile in Cura 4.8.0 for printing a small test part (a miniature studded vase in this case), but I am running into issues with the outside surface quality of the first few layers.

 

The part is printed in vase mode (spiralize outer contour) with the following basic settings:

 

Printer: Airwolf3D AXIOM Dual Direct Drive
Nozzle Size: 0.5 mm
Layer Height: 0.25 mm
Line Width: 0.5 mm
Top/Bottom Thickness: 1.2 mm
Print Temperature: 250 C
Bed Temperature: 130 C
Print Speed: 80 mm/s
Outer wall Speed: 60 mm/s
Top/Bottom Speed: 40 mm/s

 

It seems that the wall layers that correspond with the Bottom thickness have the worst quality (see attached picture). Everything above it seems to print really nicely.

 

What I have tried so far:

 

1. Adding a brim (thinking the heated bed might be overheating it) - no change
2. Reducing the print temperature thinking it was just overheating - no noticeable difference
2. Slowing down the outer wall speed (first from 60 mm/s to 40, and then all the way down to 15 mm/s) - no noticeable change in quality.

 

It seems that the presence of the bottom layers is doing "something" but I'm stumped. Any ideas?

 

Thanks!
Jason O

Edited February 27, 2021 by Jdo300

[GregValiant 1,251]

How are the lower layers on other prints?  Does it do that if printed in PLA?

[Jdo300 0]

16 minutes ago, GregValiant said:

How are the lower layers on other prints?  Does it do that if printed in PLA?

Not Sure, I haven't tried this part (or any vase mode parts) on this printer yet in PLA.

Edited February 26, 2021 by Jdo300

[GregValiant 1,251]

Not just vase mode prints, do the bottoms on any of your prints on that machine show that smashed look?  I'm asking because if that was a Creality printer I'd be thinking about Z-binding near the build plate which goes away as it gets higher.