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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

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(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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