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Retraction at end of print job


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Posted · Retraction at end of print job

Hi All,

I'm having some issues with my UM2. The problem is with the printer doing a rather large retraction at the end of the print. I understand 'why' this happens, but is there a way to disable it as it's causing serious issues.

Basically a the end of the print the UM2 does a large retraction and pulls the filament a fair way back, as this cools and when I come to do the next print (say the following day) the printer can't get the filament to get back in the hot end and as such I need to remove it all and manually re-feed it.

Any help would be appreciated.



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    Posted · Retraction at end of print job

    You may have to mush moisture in your filament, moisture makes it expand a lot and can cause these jams, also wait for the printer to fully cool before turning it off as the rear fan needs to cool the insulator down.

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    Posted (edited) · Retraction at end of print job

    The retraction at the end of print should be undone at the start of the next print:


    However, I think the retraction of 20mm is too much. I have set my firmware to 12mm quite some time ago and had no problem with it; just the opposite, I printed over 1200 hours with the first (glass filled) teflon isolator and could have printed further.

    Edited by Guest
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    Posted · Retraction at end of print job

    Obviously this is an old post but maybe somebody can help me a bit.

    I have the same problem every now and then because the retraction at the end of a print is too much. When I start a new print I first have to take out the bowden tube, cut the filament, put it back together and then move the filament towards the end of the nozzle. When i don't do it like this, the ptfe coulper wears out very rapidly and many many times it gives underextrusion and feedmotor going toctoctoc.

    Where and how can I set the retraction at end of a print from 20 to say 4mm? In the firmware's hex file? Can't find the option in the UM2 settings either.

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