Holes/ missing layers (after retraction) in 3d printed objects

  • Holes/ missing layers (after retraction) in 3d printed objects Nir

    My printed objects have horizontal holes in them (as seen I the picture below): enter image description here

    This doesn't only look bad it also makes the object break at the seems.

    Looking carefully at the printing process I can see that after a retraction there's a small amount of time the hotend isn't extruding plastic.

    Material: PLA, Printer Robo 3D R1+, Slicer: Cura

  • (answering my own question)

    The problem was the extrusion distance settings in Cura's advanced tab, reducing the value to 1.5mm solved the problem.

    Other problems with the same symptoms:

    • Partially blocked hotend nozzle.
    • Incorrectly configured steps per mm for the extruder motor - this youtube video shows how to test and configure this.

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