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It's almost certainly a Z issue in your hardware. What happens is you command a move of say .2mm layer for each layer but at some point (the bad area) it only moves .15mm and so you get .2/1.5 or 33% overextrusion which looks like a bulge. It looks like you get this for two consecutive layers and then things are fine again for a bit.
Try playing with your Z axis using pronterface (it's free):
Consider maybe putting a ruler along side your Z platform (if that is what moves) and commanding different heights. Or maybe cut power and turn by hand. Any part of the bed could be sticky or wobbly - not necessarily the screw or Z nut.
If you tape a ruler near the bed and place a pencil or something flat on the bad that lightly touches the ruler then you can command pronterface to go to various heights and look to see if it is correct. However your error is pretty small - I don't know your layer height but it looks like no more than 50% of layer height so if those are .2mm layers than the error is probably somewhere around .1mm or less - and only in that region. If those layers are .1mm layers then the error is even smaller - and that much harder to measure!
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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
It's almost certainly a Z issue in your hardware. What happens is you command a move of say .2mm layer for each layer but at some point (the bad area) it only moves .15mm and so you get .2/1.5 or 33% overextrusion which looks like a bulge. It looks like you get this for two consecutive layers and then things are fine again for a bit.
Try playing with your Z axis using pronterface (it's free):
http://koti.kapsi.fi/~kliment/printrun/
Consider maybe putting a ruler along side your Z platform (if that is what moves) and commanding different heights. Or maybe cut power and turn by hand. Any part of the bed could be sticky or wobbly - not necessarily the screw or Z nut.
If you tape a ruler near the bed and place a pencil or something flat on the bad that lightly touches the ruler then you can command pronterface to go to various heights and look to see if it is correct. However your error is pretty small - I don't know your layer height but it looks like no more than 50% of layer height so if those are .2mm layers than the error is probably somewhere around .1mm or less - and only in that region. If those layers are .1mm layers then the error is even smaller - and that much harder to measure!
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