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print head off the back of build plate during fine leveling of build plate

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first (1mm) phase of leveling the build plate works fine. When the fine adjust phase starts the print head is too far back. The nozzle is not over glass but over empty space. When it moves to the front corners it is about 1 inch back from the front edge. I am starting from the factory reset level so I can't change anything else like homing the print head. Thanks, Jon

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Which printer um2go? Can you show an overhead shot please when it is at this initial position?

I'm guessing the screws jiggled loose in shipping that are the set screws for the pulleys. Most likely the Y stepper motor pulley. Tighten the hell out of that - you might need to remove the cover to get at it or even remove the motor but I don't think that's necessary.

To get through the stupid start up procedure I would just tell the printer it's homed fine - just keep continuing through those menus. You can relevel the build plate after this is fixed - just go to menu MAINTENANCE BUILDPLATE.

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