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Random lines appearing in Cura spiral mode


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Posted · Random lines appearing in Cura spiral mode

I am currently trying to print this Fractal Pyramid in spiral mode but when I slice it and look at it in preview mode I see random lines on the 15th and 134th layer. Any suggestions on how to fix? 

pyramid capture.JPG

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    Posted · Random lines appearing in Cura spiral mode

    Most fractal pyramids I've seen have layers that have "islands" on them.  When there are islands the print head has to move from the feature it was printing, across an open space (extruding all the way), and then print the next feature.  It then does a travel move back to the original feature and starts the next layer.  Models with islands can't really be spiralized  because by definition the extrusion should be one continuous extruston from the bottom to the top and with islands it just can't be so.  Those lines you see aren't "random" at all but part of a spiral path that has to move from one area to an island.

    Since it sounds like it's only happening on a couple of layers there may be slight errors within the model that don't get connected.  You could try increasing the layer height setting in Cura, or scale the model down in the Z.  

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