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Ultimaker 2+, Cura 5.0.0, bad extrusion after filament change

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Posted · Ultimaker 2+, Cura 5.0.0, bad extrusion after filament change

I'm trying to get a color change at a given layer.

The post-processing script "Filament change" did not seem to do anything, and I've seen the recommendation to use "Pause at height", and manually change the filament in the printer interface.


I do that, let the extruded filament change color, then resume the print.


However, as soon as I resume, no filament gets out of the nozzle.


Here is the part of the gcode that does the pause, I cannot find anything wrong with that:


G0 F6750 X100.669 Y111.02
G0 F600 X100.669 Y111.02 Z0.67
G0 F6750 X101.288 Y111.377
;added code by post processing
;script: PauseAtHeight.py
;current layer: 2
M83 ; switch to relative E values for any needed retraction
G1 F300 Z1.67 ; move up a millimeter to get out of the way
G1 F9000 X190 Y190
G1 F300 Z15 ; too close to bed--move to at least 15mm
M0 ; Do the actual pause
G1 F300 Z0.67
G1 F9000 X101.288 Y111.377
G1 F300 Z0.67 ; move back down to resume height
G1 F1862.7 ; restore extrusion feedrate
M82 ; switch back to absolute E values
G92 E61.71386
;MESH:Part Studio 2 - Part 1.stl
G1 F2400 X106.288 Y102.717 E62.61384


My best guess is that the filament change procedure in the Ultimaker FW does a retraction after the change. I have no retraction in the Pause script setup, but I guess I could put a negative value there, if I knew how much the FW retracts after purging the nozzle.

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    Posted · Ultimaker 2+, Cura 5.0.0, bad extrusion after filament change

    As is typical, I finally found someone else with that issue, right after posting here.


    For now I will just lift the extruder lever and push manually, although it would be nice to understand the amount of retraction that I should compensate for, so that I could input that in the script.


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