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UM3: Lift nozzle a bit before print starts


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Posted (edited) · UM3: Lift nozzle a bit before print starts

Hi there!


We have an UM3 @work and we have installed a BuildTek flex plate on it.

Active leveling works again after inserting a nut and a spacer on the screw at the backpanel.

The problem is, that the buildplate is relatively soft, therefore the nozzle pushes a bit too deep while measuring the distance.


I would like to compensate that by lifting the nozzle to Z0.1 before the print starts.

I tried to add the following start code in CURA:

G91 ;Relative movement
G0 F15000 Z0.2  ; Move down the plate a bit
G92 Z0   ; Tell the printer that this is the zero position
G90 ;Disable relative movement


Unfortunately the printer does not do anything then... It heats up, tells me he is now starting the print but nothing happens.

Where is the problem with the start code and is there maybe another way to change the "start height" - via the dev mode and the json files maybe?





Edited by ataraxis
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    Posted (edited) · UM3: Lift nozzle a bit before print starts

    Okay, the startcode works,... there was just a non-printable Unicode sign in it 😄

    Anyways, is there another way like the mentioned json files?

    Edited by ataraxis
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    Posted · UM3: Lift nozzle a bit before print starts

    I think that's the correct way to go about it. 


    It was also the best solution I found when I wanted to change the active leveling distance slightly:


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    Posted (edited) · UM3: Lift nozzle a bit before print starts

    Thing is, I am not the only one who is using this printer, would be great to let the printer handle this additional distance himself. Otherwise everyone who wants to print has to add this Startcode and keep it up to date.

    Edited by ataraxis
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    Posted (edited) · UM3: Lift nozzle a bit before print starts

    For sure, the problem is that we are using a magnetic mounted flexplate, which is - in my eyes - prone to small deformations. We therefore level actively before every print 🙂

    Edited by ataraxis
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