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Nozzle starts too high when I slice with Cura


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Posted · Nozzle starts too high when I slice with Cura

Hello all,

 

I'm hoping you can help me, i have a prusa i3 V2 printer and have used Repetier for a long time. I want to start using Cura and have everything communicating correctly. I leveled my bed and when I home Z it's adjusted perfectly with a pc of paper. However when I slice my model and start printing the nozzle is about 1mm away from the bed. Attached is my gcode for a simple 20x20 cube. Can someone offer insight? 

 

PS I tried both Marlin and Repetier in terms of the G-Code flavor and get the same results.

 

 

PI3MK2_10mm.gcode

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    Posted · Nozzle starts too high when I slice with Cura

    I also tried reprap g-code flavor with no avail. I don't understand why the printer extruder height is correct when I home Z and yet the printer starts printing way too high to even adhere to the bed. 

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    Posted · Nozzle starts too high when I slice with Cura

    I do not see anything weird in the gcode either. I would double check if you have the right machine selected in cura (maybe reinstal it even) did you use your own profile or the basic cura profile? do you have the newest firmware. Those are the only other things i can think of. 

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    Posted · Nozzle starts too high when I slice with Cura
    G28 W ; home all without mesh bed level
    G80 ; mesh bed leveling

    These lines are prusa specific and I'm not sure if they are correct.  The rest is fine.

    Assuming you print through USB:

    1) If you print the exact same gcode file through repetier does it print fine?

    2) If you slice with repetier and print with cura does it print fine?

    Assuming you print through SD card:

    3) Please post the first 40 lines of gcode from a repetier slicing of any stl file.

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    Posted · Nozzle starts too high when I slice with Cura

    I sliced with simplify3D and printed with Cura and it worked. I'm not sure what cuts is going to make the print head start at the wrong height

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    Posted · Nozzle starts too high when I slice with Cura

    Oh!  Good.  So the problem is with probably those 2 lines of gcode I posted.  What do the first 40 lines of gcode look like from repetier?

     

    I can't tell you what is wrong with the above commands as I don't know Prusa.  You could also try asking on the Prusa forum.  Or just post the first 40 gcodes from both repetier and cura so we can see the difference.

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    Posted · Nozzle starts too high when I slice with Cura

    Below are both scripts with the first 40 lines of gcode created with simplify3d and cura (same model)

     

    Done with Cura

    ;FLAVOR:Marlin
    ;TIME:456
    ;Filament used: 0.239059m
    ;Layer height: 0.15
    ;MINX:115.6
    ;MINY:95.6
    ;MINZ:0.2
    ;MAXX:134.4
    ;MAXY:114.4
    ;MAXZ:9.95
    ;Generated with Cura_SteamEngine 4.5.0
    M82 ;absolute extrusion mode
    G21 ; set units to millimeters
    G90 ; use absolute positioning
    M82 ; absolute extrusion mode
    M104 S245.0 ; set extruder temp
    M140 S80.0 ; set bed temp
    M190 S80.0 ; wait for bed temp
    M109 S245.0 ; wait for extruder temp
    G28 W ; home all without mesh bed level
    G80 ; mesh bed leveling
    G92 E0.0 ; reset extruder distance position
    G1 Y-3.0 F1000.0 ; go outside print area
    G1 X60.0 E9.0 F1000.0 ; intro line
    G1 X100.0 E21.5 F1000.0 ; intro line
    G92 E0.0 ; reset extruder distance position
    G92 E0
    G92 E0
    G1 F1200 E-3
    ;LAYER_COUNT:66
    ;LAYER:0
    M107
    G0 F3600 X116.61 Y97.216 Z0.2
    ;TYPE:SKIRT
    G1 F1200 E0
    G1 F1800 X117.016 Y96.784 E0.01972
    G1 X117.477 Y96.411 E0.03944

     

    Done with Simply3D

    ; G-Code generated by Simplify3D(R) Version 4.1.2
    ; Mar 17, 2020 at 4:49:50 PM
    ; Settings Summary
    ;   processName,PETG
    ;   applyToModels,10mm
    ;   profileName,Prusa Research Original Prusa i3 MK3 (modified)
    ;   profileVersion,2018-01-19 08:00:00
    ;   baseProfile,
    ;   printMaterial,PLA
    ;   printQuality,Medium
    ;   printExtruders,
    ;   extruderName,Primary Extruder
    ;   extruderToolheadNumber,0
    ;   extruderDiameter,0.4
    ;   extruderAutoWidth,1
    ;   extruderWidth,0.48
    ;   extrusionMultiplier,0.9
    ;   extruderUseRetract,1
    ;   extruderRetractionDistance,1.5
    ;   extruderExtraRestartDistance,0
    ;   extruderRetractionZLift,0
    ;   extruderRetractionSpeed,1800
    ;   extruderUseCoasting,1
    ;   extruderCoastingDistance,0.2
    ;   extruderUseWipe,1
    ;   extruderWipeDistance,2
    ;   primaryExtruder,0
    ;   layerHeight,0.3
    ;   topSolidLayers,3
    ;   bottomSolidLayers,3
    ;   perimeterOutlines,2
    ;   printPerimetersInsideOut,1
    ;   startPointOption,2
    ;   startPointOriginX,0
    ;   startPointOriginY,0
    ;   sequentialIslands,0
    ;   spiralVaseMode,0
    ;   firstLayerHeightPercentage,105
    ;   firstLayerWidthPercentage,115
    ;   firstLayerUnderspeed,0.2

    G1 X117.984 Y96.103 E0.05917
    G1 X118.527 Y95.866 E0.07888
    G1 X119.098 Y95.704 E0.09862

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    Posted · Nozzle starts too high when I slice with Cura

    wtf???

     

    Okay so those lines that start with semicolon are just comments - they don't do anything for the printer they are more for you to see what settings were used when you look at the gcode file.

     

    That makes no sense.  it just starts printing without any step for purging or homing or anything.   It doesn't set bed temp, it doesn't set nozzle temp, it doesn't turn on the fan.  This works?  Okay well you need to talk to someone who knows prusa printers.

     

    Well try this - delete everything in the cura gcode file up to and including that M107 and see if it prints okay.  That will tell us something.

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    Posted · Nozzle starts too high when I slice with Cura

    I still think the problem is related to one of those 2 gcodes I highlighted.

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    Posted · Nozzle starts too high when I slice with Cura

    oops heres the gcode without the semicolons

     

    Cura

    M82 ;absolute extrusion mode
    G21 ; set units to millimeters
    G90 ; use absolute positioning
    M82 ; absolute extrusion mode
    M104 S245.0 ; set extruder temp
    M140 S80.0 ; set bed temp
    M190 S80.0 ; wait for bed temp
    M109 S245.0 ; wait for extruder temp
    G28 W ; home all without mesh bed level
    G80 ; mesh bed leveling
    G92 E0.0 ; reset extruder distance position
    G1 Y-3.0 F1000.0 ; go outside print area
    G1 X60.0 E9.0 F1000.0 ; intro line
    G1 X100.0 E21.5 F1000.0 ; intro line
    G92 E0.0 ; reset extruder distance position
    G92 E0
    G92 E0
    G1 F1200 E-3
    ;LAYER_COUNT:66
    ;LAYER:0
    M107
    G0 F3600 X116.61 Y97.216 Z0.2
    ;TYPE:SKIRT
    G1 F1200 E0
    G1 F1800 X117.016 Y96.784 E0.01972
    G1 X117.477 Y96.411 E0.03944
    G1 X117.984 Y96.103 E0.05917
    G1 X118.527 Y95.866 E0.07888
    G1 X119.098 Y95.704 E0.09862

     

    Simplify3d

    G90
    M83
    M106 S0
    M140 S80
    M190 S80
    M104 S245 T0
    M109 S245 T0
    M115 U3.0.7 ; use the latest firmware version
    G28 W ; home all axes without mesh bed leveling
    G80 ; run mesh bed leveling routine
    G1 Y-3.0 F1000.0 ; prepare to prime
    G92 E0 ; reset extrusion distance
    G1 X60.0 E9.0  F1000.0 ; priming
    G1 X100.0 E12.5  F1000.0 ; priming
    ; process PETG
    ; layer 1, Z = 0.065
    T0
    G1 E-1.5000 F1800
    ; feature skirt
    ; tool H0.315 W0.552
    G1 Z0.065 F800
    G1 X92.724 Y94.057 F5000
    G1 E1.5000 F1800
    G1 X94.057 Y92.724 E0.1227 F720
    G1 X105.943 Y92.724 E0.7733
    G1 X107.276 Y94.057 E0.1227
    G1 X107.276 Y105.943 E0.7733
    G1 X105.943 Y107.276 E0.1227
    G1 X94.057 Y107.276 E0.7733
    G1 X92.724 Y105.943 E0.1227
    G1 X92.724 Y94.057 E0.7733
    G1 E-1.5000 F1800
    ; feature inner perimeter
    G1 X95.828 Y95.828 F5000
    G1 E1.5000 F1800
    G1 X104.172 Y95.828 E0.5429 F648
    G1 X104.172 Y104.172 E0.5429
    G1 X95.828 Y104.172 E0.5429
    G1 X95.828 Y96.028 E0.5299
    G1 X95.828 Y95.828 F648
    ; feature outer perimeter
    G1 X95.276 Y95.276 F5000
    G1 X104.724 Y95.276 E0.6147 F576
    G1 X104.724 Y104.724 E0.6147
    G1 X95.276 Y104.724 E0.6147
    G1 X95.276 Y95.476 E0.6017
    G1 X95.

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    Posted · Nozzle starts too high when I slice with Cura

    You should probably talk to prusa experts.  Anyway here are some possibilities:

    1) The M115 - I've never seen that before.  That might change the functionality of the M28 command that follows it.  I'd try copying this to just above the G28 W line.  Note that G28 is where it homes the Z (and other axes).

    M115 U3.0.7 ; use the latest firmware version

    2) T0 - This chooses tool zero or in other words your primary extruder.  This isn't normally necessary for a single extruder machine.  But this can sometimes alter the Z height due to offsets in the printer for different extruder nozzles.  It sounds crazy for a single extruding machine but try it.  Put the T0 right after the M107.

     

    3) Z speed.  I notice that S3D lowers the speed to F800 - that's in mm/minute so divide by 60 to get mm/sec which is 13.33mm/sec.  Cura sets it to 60mm/sec in this line:

    G0 F3600 X116.61 Y97.216 Z0.2

    It's normally moving X and Y much farther than Z but if the head was already near X116 and Y97 then it's trying to move the Z faster than you would expect is possible (although really the firmware in the prusa should also limit the Z but maybe it's set too high or maybe there's a bug in the prusa firmware and it's not limiting the Z speed on compound moves like this  - you'd be amazed how many bugs are in there).  So I'd try lowering that F3600 to F800 to match S3D for that opening move.

     

    I'm not saying you should *always* edit your gcodes direclty - this is just the first step to figure out what is different between the slicers - once we know the problem we can fix it in cura settings.

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    Posted · Nozzle starts too high when I slice with Cura

    I think I'll stick to Simplify3d, I made the changes you advised and still no avail.... The only problem with Simplify is it can have finicky slices, where a wall will print perfectly with one model and not another. Perhaps these could be some of the model designs as well? 

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    Posted · Nozzle starts too high when I slice with Cura

    Like cura, I think S3D has something like "print thin walls" or something similar that you have to enable.

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