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Retraction issue?


Croy9000
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Posted (edited) · Retraction issue?

UM3 with Cura 3.1.0. Every few layers I am getting these drag lines while the head travels quickly to another side (maybe at the end of the layer). In this image you can see the diagonal line that was printing on the previous layers every now and again, and now that its getting into details that are above the bottom, more lines are showing up.

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I don't see these lines in the tool path animation. Its causing the layers above them to bulge up there. Is the issue the print head not retracting the material? Or the print head continuing to extrude? Any ideas?

IMG_0863.jpg?v=071250b4

Edited by Guest
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    Posted · Retraction issue?

    So after studying the g-code, and watching a simple test print I have narrowed down the issue. Its happening at the end of a layer, when the head travels to another side to start printing over there.

    Looking at the Cura settings a retraction should be happening anytime the head travels more than 0.7mm (Retraction Minimum Travel). But this is not the case (my test print is >10mm in both directions). There is only 2 retractions being written to the g-code. One at the end of the brim, and one at the very end of the print.

    Screen%20Shot%202017-12-08%20at%203.19.22%20PM.png?v=e2b841ef

    Any input would be appreciated.

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    Posted (edited) · Retraction issue?

    So after even more research I think this might be "normal". Looking at this example of what Ultimaker calls a "good" print, it has what I assume is the same line https://ultimaker.com/en/resources/21330-what-does-a-successful-first-layer-look-like.

    Also, I read somewhere today that this was a requested Cura feature. From what I can tell it helps to wipe the tip while traveling maybe?

    Anyhow. I just wanted to make sure it was not an issue with my setup.

    Edited by Guest
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