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too much retraction at beginning


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Posted (edited) · too much retraction at beginning

I don't know how or why this is happening now, but when I start a new program, the material will print my skirt, seemingly just fine. But when it goes to print the part, it has not recalled the retracted material and takes for ever to get the plastic to flow from the nozzle again. If I go to the back of the machine and release the pressure on the feeder gears and push the material forward by hand, it seems like there is a lot of material I am pushing forward. And then it prints fine. I believe I have not messed with my retraction settings, but even if I have, wouldn't the machine know enough to make up for whatever retraction it is doing? (i.e. if it retracts 1mm it will return 1mm to print and if it retracts 2mm it will return 2mm to print, etc.)


If I hold my hand on the filament, when it gets done purging, I can feel how much it retracts by holding tightly onto the filament and allowing my hand to move backwards with the retraction. When it moves into position to start the print and calls the material back in, it calls in a very small amount (like maybe 1/4 of what it retracted) and I have to release the feeder to manually shove the filament forward to start printing.


It is an Ultimaker 2 Extended Plus. Cura 4.5

Retraction settings in image.

image 1.jpg

Edited by CCA1
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    Posted · too much retraction at beginning

    Here is an image of one of my G- codes. It appears as though it might be having one too many retracts??? Is there a way to fix this????


    image 3.jpg

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    Posted · too much retraction at beginning
    On 3/16/2020 at 6:10 PM, CCA1 said:

    It is an Ultimaker 2 Extended Plus. Cura 4.5


    Your pictures do not look like the printer definition of an Ultimaker 2+. It looks more like a Mark2, but with an incorrect start script. Was this per mistake or is it somehow intended?


    I would add an "Ultimaker 2 Extended+" afresh to have a good starting point again.

    Or - if the printer is indeed a Mark2 conversion: you could add a new "Foehnsturm Mark2", adjust the z-height or compare/repair the start script.


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    Posted · too much retraction at beginning

    It IS a Mark2 upgraded printer. 😀


    I just added the Mark2 from the new list. I will compare the scripts.





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    Posted · too much retraction at beginning

    This works better! it no longer has the extra retract and my material is right there ready to print.  BUT......


    After it purges the nozzle it moves off to the left and down onto the build plate and drags across right through the purged material and then drags that to the where it starts the print. Where did this extra move come from?? It worked great before, just stopping the purge and then moving to the print. Not sure how to edit this out of there?



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    Posted · too much retraction at beginning

    OK, so I've modified the .json file to not do this anymore. I will work with it to see what else I can do.


    Thanks for the help Tinkergnome!

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