Dim3nsioneer 557
I had this effect once. It was caused by the minimum extrusion amount between two retracts. The situation was that a short travel, a very short printing distance and a longer travel followed each other. Retraction was performed on the first short travel due to the minimum travel length. Then the print distance was performed but as it was very short it was not really visible. After that the longer travel was performed but as the minimum printing amount between two retracts was not reached the longer travel was performed without retraction. All together it looked like it would retract, prime and then travel.
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gr5 2,072
This sounds crazy. I've never heard of this. Did you choose "ultimaker 2" for you machine? What is the retraction length and speed set in the menus on the actual printer? I recommend 4.5 to 5.5mm.
Look through the gcode with a text editor. The retraction/unretraction commands are G10 (retract) and G11 (unretract). You could look for those codes.
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