Blobs after changing to Duet 2

Phaedrux

@dc42 Can you describe what the difference between M566 P1 and P0 actually is? I think I get better results with P1, but maybe I'm not clear about what it's actually doing differently.

https://duet3d.dozuki.com/Wiki/Gcode#Section_M566_Set_allowable_instantaneous_speed_change

The default jerk policy is 0, which replicates the behaviour of earlier versions of RRF (jerk is only applied between two printing moves, or between two travel moves, and only if they both involve XY movement or neither does). Changing the jerk policy to 1 allows jerk to be applied between any pair of moves.

Does that mean that the transition between a print move to a travel move will be faster or slower? I take it to mean that P0 there is no jerk applied between a print move to a travel move, so it would come to a full stop? But with P1, the X Y jerk would be applied allowing for less of a slow down?

PXP11

After some testing with M566P1 I noticed instant differences. Firstly the extruder was snappy as f***. Actually started skipping steps because of the high jerk. Went back to 1500mm/s, worked fine after that, still might be a bit too much to the point where it is not retracting but ripping apart the filament inside the hot zone.
Here is the video from the small cylinder, same gcode: https://1drv.ms/v/s!Alyk1AJNCCDtlQzyyP3EWgJVEntP

The following cubes were done with four different slicers. As far as possible with the same settings. 0.4mm retraction @60mm/s 0.2mm wipe.

S3D

IdeaMaker

PrusaSlicer

Cura

Prusa looked the best as far as the z-seam (or lack there of) goes. Over all Ideamaker gives the best whole picture. I'm sure I can improove the quality even further.

I'll be doing some more test with different filaments and M593 DAA so I can go higher on XY acc and jerk to further reduce time spent over areas while retracting (without inducing artifacts on other areas).

dc42

@PXP11, thanks for that. Is it your opinion that using M566 P1 has solved the problem, and your prints are no longer worse than they were using Marlin?

PXP11

@dc42
Well M566P1 changed the movement behaviour a lot. To the better that is. I don't know why this is not yet the standart when using the configurator tool.
Quality wise I'm not quite there yet but I'm sure some further tweaking will get me the same if not better results than Marlin. Even if not, RRF has spoiled me and I'm never going to switch back.

Thanks for the valuable tip.