burtoogle

Thanks a lot for the the gcode file, I can see where it's not retracting and that doesn't look right. Could you also please provide a project file for that print? Do File->Save and attach the .3mf file to this thread. Thanks.

No, that's not how current Cura is coded. It does the retraction before the z change. What version of Cura are you using? Could you please provide a complete gcode file rather than just a snipped. Thanks.

The contents of that file are: MESH-MESH-MESH-MESH-MESH-MESH-MESH-MESH-MESH-MESH-MESH-MESH-MESH-MESH-MESH-MESH @Framar is right, it's not an STL file.

This is relevant... https://github.com/Ultimaker/Cura/issues/8010

The gap is caused by coasting being enabled.

Could you please attach the stl file to this thread, thanks.

Machine start, I didn't change the tool start codes.

With this start g-code... ; start g-code M104 T0 S{material_standby_temperature} M104 T1 S{material_standby_temperature} G90 G28 X0 Y0 Z0 G1 Z5 F1000 G92 E0 G1 Y-32 F12000 G1 E15 F800 G4 S5 I now get... ;FLAVOR:Marlin ;TIME:42781 ;Filament used: 27.227m, 4.76933m ;Layer height: 0.2 ;MINX:128.132 ;MINY:88.46 ;MINZ:0.3 ;MAXX:178.225 ;MAXY:233.54 ;MAXZ:103.35 ;LINEARADVANCEPROCESSED ;Generated with Cura_SteamEngine master T0 M140 S60 M105 M190 S60 M82 ;absolute extrusion mode ; start g-code M104 T0 S175 M104 T1 S175 G90 G28 X0 Y0 Z0 G1 Z5 F1000 G92 E0 G1 Y-32 F12000 G1 E15 F800 G4 S5 G92 E0 ; right extruder M109 S255 M104 T1 S175 G1 Y-32 F12000 ; move to wipe Y position G91 ; set to relative G1 E15 F200 ; extrude 15mm G4 S2 G92 E0 ;zero extruder G1 X290 F12000 ; perform wipe sequence ... So the first m109 is when it selects the first extruder. Is that any better ?

Thanks for the file, don't worry about paypal, I do this for fun! However, I only actually do single material prints myself so I'm not at all knowledgeable about tool changing so maybe someone else who has some experience with that can comment?

Could you please provide a project file? Do File->Save and attach the .3mf file to this thread. Thanks.

I believe that if the start code contains some magic keywords then the temperatures will not be set again by Cura. Have something like this in your start code... M104 S{material_print_temperature} M109 S{material_print_temperature}

Actually, I think it will do better if you turn off combing completely and increase the min wall flow to 80 or thereabouts.

Hello @Bassam, could you please provide the project file? Do File->Save and attach the .3mf file to this thread. Also, what system are you using? Windows, Mac, Linux?

Oh, yeah, I also changed the z-seam position as the sharpest corner scheme rarely does what you want.

I made a couple of tweaks: 1 - set min wall flow to 50% to stop inner walls being printed on top of each other. 2 - set inner wall width to 0.5 to stop the inner wall dropping out where the overall wall thickness is less than 1.5mm. This now takes around 17.5 hours to print which is 3 hours faster than the original project. Hope this helps. CE3_133318400_Mountv2.3mf

Could you please provide the project file? Do File -> Save and attach the .3mf file to this thread. Thanks.

It's done already, the 20200703 release has the fix.

I would suggest try reducing the retraction distance in 0.5mm steps and see if (a) the holes go away because you had too much retraction or (b) you start to get stringing or blobs because you have not enough retraction. Obviously, you can test this on a small model rather than your big print.

You can normally tell if it's air because you can actually hear little pops as the bubbles come out of the extruder.

Yes, but your model has no infill and you normally print infill before walls (so it says in your profile) so the air could possibly be expelled in the infill (when you use infill) and you would not notice the holes.

I would hazard a guess and say you are using too much retraction which is sucking air into the extruder.

It wasn't the standby temps causing the issue (they are ignored) it was a bug in the shared heater code. I will submit a fix to be included in a future UM Cura release. In the meantime, I will put the fix into my next Cura build if you care to use one of them. You can find my builds at https://www.dropbox.com/sh/s43vqzmi4d2bqe2/AAADdYdSu9iwcKa0Knqgurm4a?dl=0 Please read the README.md file there before using. What system are you using?

Actually, I'm not sure that is the issue, I'll look some more.

Nozzles 2 and 3 have a standby temp of 175, you need to make it the same as the print temp.

Hi @Balbers01, could you please provide a project file that has this problem? Do File->Save and attach the .3mf file to this thread. THanks.