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:
I have been studying the differences between version 2.x and version 4 of the P3Steel frames - in particular the AC08 bracket at the top of the frame which secures the top of the smooth bars and threaded rods of the Z axis on both the left and right sides. Here is the laser cut parts, for version 1.x, showing the part labelled as AC08: Version 1.x/2.x has the AC08 bracket with two holes, one for the threaded rod and one for the top of the smooth bar (from the lasercut image): However, in version 4, the corresponding top Z axis bracket only has one hole for the smooth bar and just
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. I am keen to buy an aluminium PCB heatbed for my P3Steel v.4 printer, which has a larger build area of 200 mm x 300 mm. So, after some searching, I found this MK2A: MK2A 300x200mm Aluminum Heated... 12V/24V Perfect for Prusa i3 3D Printer. Note: this is not a shopping question, I am merely providing a background to my questions. While the RepRap wiki is full of information, the information can... not sure if this should be a separate question) I would have also asked whether aluminium PCB heatbeds are worth the additional cost, over standard PCB heatbeds, but for the slightly less common
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, but if the extruder has to move large distances (e.g. when I print the same object near the front and near the back of the print bed), they can reach up to 2 cm or so. In those cases the extruder seem to move the wrong distance towards the back, resulting in a shifted layer, and then moves about the same distance towards the front. Therefore objects at the front of the bed often are shifted less than at the back. Here's an example of some small shifts in the 3D benchy (printed near the front of the bed). They are particularly obvious in the hull and in the supports of the cabin: I've tightened
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