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So from the image it appears your model isn't sitting flat. One circular area is touching the bed but the rest is not - it is maybe 0.00000000000001mm higher.
You could fix it in cad but a faster fix is in cura. Go to menu "preferences" "config cura" and go to "general" tab and uncheck "automatically drop models to the build plate".
Then use the move tool and click on the part and set the Z value to a negative value. Try -0.2mm to start then move that value closer to 0mm until it slices "wrong" again and go back. If you are lucky you only have to shave off 0.1mm of the bottom of the part to get it to print "correctly".
Cura 5.7 is here and it brings a handy new workflow improvement when using Thingiverse and Cura together, as well as additional capabilities for Method series printers, and a powerful way of sharing print settings using new printer-agnostic project files! Read on to find out about all of these improvements and more.
S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
(Sorry, was out of office when this released)
This update is for...
All UltiMaker S series
New features
Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
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gr5 2,167
So from the image it appears your model isn't sitting flat. One circular area is touching the bed but the rest is not - it is maybe 0.00000000000001mm higher.
You could fix it in cad but a faster fix is in cura. Go to menu "preferences" "config cura" and go to "general" tab and uncheck "automatically drop models to the build plate".
Then use the move tool and click on the part and set the Z value to a negative value. Try -0.2mm to start then move that value closer to 0mm until it slices "wrong" again and go back. If you are lucky you only have to shave off 0.1mm of the bottom of the part to get it to print "correctly".
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