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OctoPrint to extrude 10 cm


gauthier
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Posted (edited) · OctoPrint to extrude 10 cm

I am trying to use Octoprint on my Ultimaker 2+, in order to perform my extruder's estep calibration.

 

When I try to extrude 100 mm, only about 35 mm are extruded. I guess there is something I missed when setting up the machine in Octoprint, what could it be?

 

The octoprint terminal says: 

Send: G91
Recv: ok
Send: M83
Recv: ok
Send: G1 E100 F300
Recv: ok
Send: M82
Recv: ok
Send: G90
Recv: ok

 

Edited by gauthier
more gcode
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    Posted · OctoPrint to extrude 10 cm
    2 hours ago, gauthier said:

    When I try to extrude 100 mm, only about 35 mm are extruded. I guess there is something I missed when setting up the machine in Octoprint, what could it be?

     

    If my calculator is right, you try to extrude more than 30mm³ per second. Are you sure that your printer can handle this?

    That's nearly 8 times more - compared to the feedrate in the linked article.

    Don't forget that these instructions are made for a much smaller filament diameter (1.75mm).

     

    What happens, if you choose a more reasonable feedrate (e.g. F40 instead of F300)?

     

     

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    Posted (edited) · OctoPrint to extrude 10 cm
    12 hours ago, tinkergnome said:

    What happens, if you choose a more reasonable feedrate (e.g. F40 instead of F300)

     

    Right! There is a flow rate field just below the extrude control in the octoprint dialog. I tried to set it to 20 %, but it somehow wouldn't bite. 

     

    On the other hand I didn't want to believe in that, because I would expect the extruder to skip if that was the case. It felt smooth and silent. Was that a wrong assumption? 

    Edited by gauthier
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    Posted · OctoPrint to extrude 10 cm
    1 hour ago, gauthier said:

    On the other hand I didn't want to believe in that, because I would expect the extruder to skip if that was the case. It felt smooth and silent.

     

    first comes slipping - and it starts long before skipping

    I think, that's what happened.

    (please - don't quote me outside of this context 😛)

     

    • 35 mm filament length corresponds to a volume of approx. 220 mm³
    • the extrusion lasted for 20 seconds - that means approx. 11 mm³ per second
    • and 11 mm³ per second is very near the maximum extrusion rate the UM2 can achieve (depending on material, temperature and nozzle diameter)
    • only circumstantial evidences - but still...🙂

     

     

     

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    Posted · OctoPrint to extrude 10 cm

    For anyone visiting this topic looking for the solution/setting this is what I did, following the all3dp instructions, but measuring at the end of them bowden tube (cutting the filament flush):

    - m503 => E282.00

    - G1 E100 F100 => 72mm

    - 282 / 72 = 3.9166  => new value for E in printer profile = 390

    - G1 E100 F100 => 103mm

    - 390 / 102 = 3.8235  => new value for E in printer profile = 380

     

    Measuring at the bowden end, is a bit less accurate since there is about 1mm play in it, but it is much more convenient when the machine is loaded with black PLA. 

     

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