Pause at layer - problems

[Bertaz31 0]

Good morning,

 

I'm doing several tests with filament change, but I have the same problem every time, I'm using the "Pause al layer Height" funcion in Cura, indicating the layer number. Once the print is paused (using M25, as I had several issues with M0), I change the filament, However, when I resume the print, it starts from a much higher Z coordinate (about 20mm above the piece). Can you help me? I'm using Ultimaker Cura 5.3.1 and an Ender 3 V2 NEO printer

 

 

Filament change test_pauseV2.gcode

Edited June 3, 2023 by Bertaz31

[GregValiant 1,307]

THIS POST has some background on what is going on.  The problem (besides M0 not working) would appear to be that the way M25 is configured in your firmware causes it to blow through the Z moves that should return the nozzle to the working height.  Not a problem when the Pause is above 15mm, but a problem when the Pause occurs at a low layer.

You can try this in the PauseAtHeight settings:

In the "Gcode Before Pause" box enter:  M400

In the "Gcode After Pause" box enter:  M117,M117,M117,M117,M117,M117,M117

The commas in the M117 line should split up the commands so they each end up on their own lines in the gcode.  The M117 commands don't do anything but take up space BUT they push the Z move lines down in the gcode so they get acted on instead of stepped over.

It's worth a test anyway.

 

[Bertaz31 0]

Many thanks Greg for your help, i'll try as soon as the printer is free

 

[GregValiant 1,307]

I'll leave the kudos off the the side until we see if it works.  There are 1 or 2 other things you can try as well.

[Bertaz31 0]

Still the same problem. At about 10mm I inser a magnet in the piece and resume, but it resumes about 40mm higher

The Gcode seems correct, with the last mod we added

 

M400
M25 ; Do the actual pause
M117
M117
M117
M117
M117
M117
M117

 

Maybe i should try the workaround with "search and replace" as you suggested in the post you linked above..

Tomorrow i will try and see what happens! thanks!!

 

Quote

Search and Replace

- Search = M25

- Replace = M25\nG91\nG1 Z5\nG90\nG1 X0 Y0 F6000\nM117\nM117\nM117\nM117\nM117\nM117

 

The "G1 X0 Y0 Z15" portion should be the same X and Y that you park the print head at.  The "\n" (backslash + n) is the newline character.  The M117's will pad the printer/planner buffer with commands that don't do anything.  Six of them should be sufficient but you might need a couple more as it is dependent on your mainboard buffer memory.

 

CE3E3V2_POrta_magnete_tenda.gcode