Weird "artifacts" on print surface with 3.6.0-alpha builds

Exerqtor

System info:
Duet Mini 5+ v1.02 (3.6.0-a4), Duet 1LC v1.2a (3.6.0-a4), standalone, 24v, CoreXY, 3-point bed leveling with individual Z steppers.

I thouched on having some weird "ringing-like artifacts" on the surface of prints who had debossed surface text.

But because of the bed leveling bug I wasn't able to test it, before today.

I slapped together a test model in fusion and went to club, and here is the results.
The print is done with pressure advance changing every 10mm in these increments:

0-10mm = PA: 0.045s.
10-20mm = PA: 0.025s.
20-30mm = PA. 0.01s.
30-40mm = PA: 0.0075s.
40-50mm = PA: 0.005s.
50-60mm = PA: 0s / off.

alt text

(YES I acknowledge that I have to make the "X" &" Y" extend top/bottom, I will fix that for the next test set)

Other machine / print settings:

Input shaping : ZVD @ 40.9Hz & 0.0 damping factor.
Outer wall acceleration : 3000mm/s2.
Inner wall acceleration: 5000mm/s2.
Outer & inner wall jerk: 7mm/s.
Outer wall speed: 120mm/s.
Inner wall speed: 200mm/s.

I would like to conlude that somethings not ready for primetime just yet! 😂

Exerqtor

Uhm, will any og these commits possibly effect imperfections i'm talking about in this thread @dc42 ?
Commit 1 & 2.

dc42

@Exerqtor please try again using 3.6.0-alpha.5. There is a bug fix since alpha 4 that may well be relevant.

Notepad

Im currently testing a new machine which prints faster with a large melt chamber length, and i can corroborate this behaviour is also very present after text.

dc42

@Exerqtor @Notepad please re-test using 3.6.0-beta.1. If the problem is still present, please create a new thread about it, including [3/6/-beta.1 in the title. and link to this thread if appropriate.