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Output in printer is all a big blob


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Posted · Output in printer is all a big blob

Trying my fist test box, just to make sure it works ok, and no it doesn't.

I just get a big blob of plastic around the nozzle.

I have some other g.code files that work ok so i know its not the printer

I'm using a Creality 3 v2 unit and my file was created in freecad, not sure were the good one comes from.

Are my settings incorrect in Cura, or freecad.

The first lines seem ok, the  side line looks good as do the first lines of the box but then it just goes bad, and looks like it is lifting the placed plastic up.

if is swith back to the other project it works fine.

 

Any ideas would be a great help

Gunk from printer.jpg

test.gcode CE3_fan holder.gcode

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    Posted · Output in printer is all a big blob

    If you could provide the Cura project file (.3mf, get it set up like you're going to print it then go to File > Save Project) that would really help. It's hard to tell just from the gcode file what settings might be causing something.

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    • Solution
    Posted · Output in printer is all a big blob

    The default values are fine.  As you gain experience you'll figure out to tweak the settings so they are better for each particular model.

     

    I get a "no models in the file" warning when I try to open that 3mf file.  I'm working from the gcode files.

     

    The "test.gcode" file does not have the auto-leveling command (G29) in the StartUp gcode.  The "CE3_fan holder.gcode file does have the G29 command.  "test.gcode" might simply be starting with too big of a gap between the nozzle and the build plate which causes a "no squish" situation.  The first layer isn't getting stuck to the bed and the nozzle is just dragging the plastic around.

    If you have an Auto Bed Leveling system then you will need to add a command to your StartUp gcode.

    If you do not have an ABL, then you will need to learn to "level" the bed with a piece of paper (that's how I do it).  (You're not really "leveling" anything, but that's what everyone calls it.)

    In a perfect world the top of the build plate would always be at Z=0.   Since it isn't, it needs to be adjusted.

     

    In Cura go to "Settings | Printer | Manage Printers" and then "Machine Settings".

    In the lower left text box is your StartUp Gcode.  It's function is to get the printer ready to go to work.

    See if the G29 line is right below the G28 line.  If it isn't then you should add it.

    This is from the "CE3_fan_card_holder.gcode" file.

    ; Ender 3 Custom Start G-code
    G92 E0 ; Reset Extruder
    G28 ; Home all axes
    G29 ; BLTouch
    G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed

     

    This is from the "test.gcode" file.  There is no G29 line.

    ; Ender 3 Custom Start G-code
    G92 E0 ; Reset Extruder
    G28 ; Home all axes
    G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed

     

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    Posted · Output in printer is all a big blob

    Just an extra note,

    Being a complete noob, i installed Cura and used the default settings for printing.

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    Posted · Output in printer is all a big blob

    Hi Again,

    Thanks for the information about the Cura settings, i just tried that, even after adding the option as you said i had to manually add it to the gcode file using notepad.

    I still get the same result, as soon as it starts printing the plastic is not sticking to the bed, even when just at the start it runs up and down the LHS. It is also doing a bed leveling using the sensor.

     

    I appreciate the  help so far and hope to get over this soon.

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    Posted · Output in printer is all a big blob

    Could it be one of these settings, there is some differences in these numbers as well

    From Test.gcode

    ;MINX:94
    ;MINY:99
    ;MINZ:0.2
    ;MAXX:140.999
    ;MAXY:136
    ;MAXZ:10
    ;TARGET_MACHINE.NAME:Creality Ender-3
    ;Generated with Cura_SteamEngine 5.9.0
    M140 S50
    M105
    M190 S50
    M104 S200
    M105
    M109 S200

     

     

    And from the Fan holder Gcode file 

    ;MINX:99
    ;MINY:94.393
    ;MINZ:0.2
    ;MAXX:140.607
    ;MAXY:137
    ;MAXZ:1.88
    ;Generated with Cura_SteamEngine 4.9.1
    M140 S70
    M105
    M190 S70
    M104 S240
    M105
    M109 S240

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    Posted · Output in printer is all a big blob

    Success, I used an output from Freecad that was setup with the Creality 3 v2 printer and then sent the output to the  Creality Slicer, still had to add "G29 ; BLTouch" to the Gcode file after it was created. But i also added a Brim to the model in the Crealtiy 3D printer settings. It did have some plastic strings floating about but it cane good and it got this....

     

    Thanks for the help so far, I'm sure i'll need some more in the future but so far so good.

     
     

     

    First GOOD Output in 3D.jpg

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    Posted · Output in printer is all a big blob

    When you use the ABL, there is a setting called "Z Offset" that needs to be adjusted.

    The Z-offset is the difference between the end of the ABL probe, and the end of the nozzle.  It's a small fudge factor that will insure that the printer knows exactly where the top of the build surface is.

    Maybe @Slashee_the_Cow can explain how to figure out what the number should be, and how to input it to the printer.

     

    (I don't know this as I don't have an ABL, but it would seem to me that the Z-offset would need to be adjusted whenever you change nozzles.)

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    Posted · Output in printer is all a big blob
    1 hour ago, GregValiant said:

    When you use the ABL, there is a setting called "Z Offset" that needs to be adjusted.

    The Z-offset is the difference between the end of the ABL probe, and the end of the nozzle.  It's a small fudge factor that will insure that the printer knows exactly where the top of the build surface is.

    Maybe @Slashee_the_Cow can explain how to figure out what the number should be, and how to input it to the printer.

    Can't say I'm exactly sure what the Z offset is an offset from, but I'm pretty sure that it's not from the ABL probe. My Z offset changed greatly when I installed my linear rail (which moved the X axis carriage higher, both nozzle and probe). The E3V3SE auto calibrates it (and generally gets it about 0.02mm lower than it should be) by moving the print head down onto the plate slowly, and there's pressure sensors in the bed. Don't ask me how it works. Being a Creality thing, the surprising part is that it mostly does.

     

    How to calibrate it yourself by hand? Paper test! Get the printer to home itself, put a bit of paper between the nozzle and bed, and move the Z to 0. Then play with the Z offset setting until you can move the paper around, but feel a little bit of resistance from the nozzle when you do it.

     

    I can't tell you how to do this from the interface on a regular E3V2. I had the E3V2 Neo which comes with the colour screen so the interface is different.

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    Posted · Output in printer is all a big blob

    This is how I understand it in marlin land (the method is the same but specific to marlin). I'm sure someone much smarter than me will find an issue in this but... here goes. 


    They hardcode "we designed the booger shooter to be (Q,R,S)mm from probe trigger to noz". Then you adjust the Z specific value (S)  with the Z offset. They set the designed value in the firmware at build time (build variable for Z offset from probe is Z_PROBE_OFFSET_FROM_EXTRUDER). I'm not going to bother looking, but on my E3S1P I recall it being 15mm or so. I now run a calibrated Z offset at -3.67 which means the end of my noz is 11.33mm from the "zero point" of my ABL. 

     

    So basically when you G28 Z, the gantry just moves until ABL tiggers, the firmware applies the hardcoded - calibrated z offest (Z_PROBE_OFFSET_FROM_EXTRUDER - -3.67) then calls that "Z=0" (kind of like G92 Z0 but globally). This is basically the floor of the bounding box of the build volume. ABL maps are overlaid on the floor (including negative values) to allow for "creality quality" build plates. 

     

    So if you have a fancy "capacitive" or preassure sensor, Z_PROBE_OFFSET_FROM_EXTRUDER should be == 0 since the end of the noz is the designed offset. With these you shouldn't need to set Z offset with paper, just ... set it to 0.D where D is the gap you want. This means that your Z offeset should be a positive number. That's the theory anyway. From what I've seen though, I think manufactures are still setting Z_PROBE_OFFSET_FROM_EXTRUDER to something to make it familiar. 

     

    You can change the Z_PROBE_OFFSET_FROM_EXTRUDER with M851 on some printers but you really shouldn't unless you know what you are doing. And for the most part you don't need to. 

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    Posted · Output in printer is all a big blob
    8 hours ago, jaysenodell said:

    So if you have a fancy "capacitive" or preassure sensor, Z_PROBE_OFFSET_FROM_EXTRUDER should be == 0 since the end of the noz is the designed offset. With these you shouldn't need to set Z offset with paper, just ... set it to 0.D where D is the gap you want. This means that your Z offeset should be a positive number. That's the theory anyway. From what I've seen though, I think manufactures are still setting Z_PROBE_OFFSET_FROM_EXTRUDER to something to make it familiar. 

    I stand by my statement. The printer previously calibrated itself to a Z offset of about 0.6. Since I installed the linear rail, now it's -2.2 (or more importantly, after I installed the linear rail and forgot to calibrate it, it gouged itself a nice trench in the build plate... that's why I keep a spare on hand). The linear rail changes nothing about where the ABL probe is relative to the nozzle, since the probe is screwed into the extruder housing then the extruder housing is screwed into the X carriage. The linear rail does however move the X carriage from its original height - it comes with a new one (because one that attaches to wheels is no longer particularly useful, the new one mostly but not completely offsets where the daughterboard and components screw in).

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