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UM3 Firmware roll back from 5.3.0


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Posted · UM3 Firmware roll back from 5.3.0

I'm looking for UM3 firmware circa 5.1.xx

I recently upgraded to 5.3.0 to enable PETG printing, made a few good prints then started getting spongey prints (lack of extrusion/grinding). I did all the usual checks and a whole bunch of maintenance with no improvement.

I changed back to PLA and the same thing! I've even  swapped out the AA core for another AA core and still the same problems.

I'm using known good print files so that isn't the issue.

Anyway the only thing I can think of is that it could be the firmware. So where can I get older versions of the firmware?

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    Posted · UM3 Firmware roll back from 5.3.0

    Hi @SilverDynamic,


    I doubt this is an error due to firmware update, -but this very much looks like a faulty forward fan (the one cooling both nozzle "cold" end).

    If this fan stop, due to collected filament stringing blocking the fan or due to an electrical issue.

    The heat creep up into the upper tube and softening the filament to early. This issue block/reduce the feeding and will lead to under extrusion that finally may stop all feeding..


    This is a known issue.


    Good luck



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    • 2 weeks later...
    Posted (edited) · UM3 Firmware roll back from 5.3.0

    I think I agree with @Torgeir but far be it from me to deny you the freedom to choose which firmware version to run.

    5.1.x firmware is tricky since that used a different update mechanism so you can't downgrade the normal way to those versions, you'll need to install the firmware using a microsd card as if you are unbricking your printer, there is a nice guide on how to do that by @gr5


    Let us know what it was if you find out what the problem was?

    Edited by robinmdh
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    Posted · UM3 Firmware roll back from 5.3.0

    Thanks for the help guys! 

    I had this problem before and it is temp related. In this case though I increased the print temp by 5 degrees and the problem was solved. I'll check my fans though as that's great advice and I can see how it causes an issue.

    However I'm now wondering if that in all the commotion around checking/cleaning tubes etc I might have cleared said fan and...

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