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Inconsistent Layers

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I’ve been having issues with my Ultimaker 3, as shows in the pictures, some layers print inconsistently and there is a gap in between some of the layers. I’ve attached the settings. 


NOTE: The speed was actually 20 mm/s for both Infil and Print


i also noticed the infill has gaps in between layers as wel. Any ideas on what might be wrong or how to fix this?








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Your settings do not seem to reflect the model shown. Apart from a setting of 70mm/s when you say 20mm/s, the base of the boat has no bottom but your settings say top/bottom thickness 2mm - all very strange. Quite possibly problem is due to under-extrusion but difficult to say as you have not quoted extruder temp. Otherwsie is could be a problem with your feed system/filament - maybe the filament is poor quality with uneven thickness which is causing it to stick inside the Bowden tube

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