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Lift Switch problem

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Hello all,

recently I have been having a problem at the begining of a dual extrusion print on the Ultimaker 3. I have had the printer for a while now, and its a printing beast for the most part. Recently though, when getting ready to use the Lift switch for the first time in a print, the head will bang against the side of the printer making a really loud noise and then fail to connect with the lift switch. This results in printcore 2 being higher than printcore 1, so placing filament is a no go since its too high above the build plate. Also when this happens, its like the XY is all messed up and it tries to print the PVA about an inch away from where it is supposed to print. I have done an XY calibration and a lift Calibration to no avail. Does anyone have any ideas. It doesnt happen every time. I have used two different laptops and tried multiple different files. 

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There is a lift switch calibration procedure you can run on the UM3.  It's in the menu system somewhere.  It sounds like you need to do this.

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I have done the Lift switch calibration and it seems to go smoothly. Is is possible that there is something going on with the GCode. Does anyone know what the gcode commands are for the lift switch. Maybe I can dump the logs and check there to see if there is a problem.

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