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UMO bed does not lower every time after print


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Posted · UMO bed does not lower every time after print

For the most part, my prints end up of pretty decent quality and the bed usually lowers after each print. Exactly how you would want it. Occasionally, it does not lower after the print, leaving the hot extruder in contact with the finished print. As you can imagine, this ruins an otherwise fair finish. Of course it typically happens with long prints, though it happens with shorter prints too.

Some Google Fu does not tell me what happens and how I can fix it. Do you guys have any idea? It is not game breaking, but it is becoming somewhat annoying. If I could prevent it, that would be great.


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    Posted · UMO bed does not lower every time after print

    This is very common when printing through USB. Do you print through USB? Or with an SD card?


    The former. I print via USB. I have a lot of small changes to make to my models, using an SD card would be quite a hassle.


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    Posted · UMO bed does not lower every time after print

    This is weird. Today I printed a long print via a controller and I got the same result. Luckily I was standing right next to it, so I could prevent major damage, but there still is a dimple visible. I also noticed it did not quite finish the last layer. A small patch of about 1 centimeter square was left unprinted.

    This is all quite odd, as the three hour print did not cause any trouble. Any ideas on how to fix this?

    Update: this is very strange. Looking at the G-code, the troubled print just seems to end:


    G0 F9000 X84.83 Y104.86
    G1 F3000 X80.10 Y100.14 E3013.96344
    G0 F9000 X79.54 Y100.14
    G1 F3000 X84.26 Y104.86 E3014.00523
    G0 F9000 X83.70 Y104.86

    While the correctly printing file has a footer:


    G1 F3000 X32.06 Y42.14 E116.01087
    G0 F9000 X32.34 Y41.30
    G1 F3000 X34.82 Y38.82 E116.03279
    G1 F2400 E111.53279
    G0 F9000 X34.82 Y38.82 Z13.15
    ;End GCode
    M104 S0 ;extruder heater off
    M140 S0 ;heated bed heater off (if you have it)
    G91 ;relative positioning
    G1 E-1 F300 ;retract the filament a bit before lifting the nozzle, to release some of the pressure
    G1 Z+0.5 E-5 X-20 Y-20 F9000 ;move Z up a bit and retract filament even more
    G28 X0 Y0 ;move X/Y to min endstops, so the head is out of the way
    M84 ;steppers off
    G90 ;absolute positioning

    I reexported the same file, and now a header appears. It seems Cura simply does not supply the full file at times. Is this a known problem?


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