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unable to level bed, bed too low for the screw


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Posted · unable to level bed, bed too low for the screw

Hi, I have the following error "difference between printcores...." so I think it was time to make a bed leveling...but in manual mode... I tried to turn the screws to have one mm but the bed is too low... the screws were at the end of what they are able to unscrew....I still have 2 mm and nothing to turn on screw.... any ideas? (all 3 screws)



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    Posted · unable to level bed, bed too low for the screw

    What printer? Usually on UM printers the first turn is the wheel in front for gross adjustment and then you use the individual screws. I am going to assume UM3(X) because you said printcores.


    Also, you can get that error if there is gunk left on the nozzle or if a bit of filament dribbles out. Also, make sure you have the cores set well.

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    • 2 weeks later...
    Posted (edited) · unable to level bed, bed too low for the screw

    I have struggled with manual levelling as well. After a bit trial and error (and a lot of forum searching) I have found a sufficient method for manual levelling.

    Sice I have dropped the auto levelling completely.


    1. Start manual level mode. 

    2. Before rotating the knob to set the z distance of far back position to 1mm, loosen the back screw for a significant amount (let say at least 2 to 3mm - just eyeball it)

    3. Rotate the knob and set the z distance of far back position to 1mm. DO NOT EYEBALL 1MM use some "1mm calibrating card*" and raise it until you feel a bit of resistance.

    4. For the other two positions use the same 1mm calibrating card and you should have enough space to loosen the remaining two screws until you feel a bit of resistance on your card.


    4.1 If you don't have enough distance to loosen the front screws go to STEP 2 and loosen the back screw a bit more. That should give you enough distance for STEP 4.


    When executing the second round/fine tuning of manual levelling do this:


    5. For fine levelling of far back point use provided UM calibration card. This is now important! Instead of tuning the distance with the screw but turn the knob - it will raise/lower the bed, and set the z distance with turning the knob until you feel a bit of resistance on your calibration card. Again, turn the knob instead loosening the screw. This is a software glitch on the UM3.

    6. Move to the front two positions and set your distance using UM calibration card. Tighten/loosen the screws until you feel a little bit of resistance on your calibration card.

    7. Follow the instructions and set the Z height of the bed as instructed by your UM.


    This should give you perfectly levelled heat bed. Turn off active levelling and test your settings on a small print. If you have any questions just ask :)



    *1mm calibrating card I made from stacking 3 business cards on top of each other and proofed it with a calliper. Use whatever you can find that is 1mm thick. I would recommend some sort of softer material like cardboard. 


    EDIT: If your screws are loosened all the way then in STEP 2 tighten the screw before rotating the knob to set 1mm distance.

    Edited by brianskyze
    Unclear question
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    Posted · unable to level bed, bed too low for the screw

    The part of the leveling where you level it 1mm above - that's not really necessary - that's very rough and only needed to avoid smashing the glass later on.  Unless I have taken apart the bed I skip that step (continue continue continue).

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