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unable to level bed, bed too low for the screw

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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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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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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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