1 Topic by mdrVB6

  • mdrVB6
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Topic: Cura is putting a large retraction right before the start of my print?

Title basically says it all.  This is a weird one.  Repetier host with Cura engine.  Right before it starts the skirt, it just puts a random retraction in there, causing the actual skirt to start printing later.  Sometimes, the retraction is long enough that it actually ejects the filament, failing the print before it even starts.

Any suggestions?  I've looked all over the settings and I can't see why it is doing this.

SD4 w/ RUMBA, E3D Volcano, all bearings, glass bed

2 Reply by grob

  • grob
  • grob
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Re: Cura is putting a large retraction right before the start of my print?

I don't know so much about cura, but is it possible that the extruder distance is not zero when the print starts (e.g. you've primed it manually, and the start code hasn't reset it), and cura's first extrusion command (being absolute) is actually negative by some amount?

Try putting "G92 E0" in your repetier-host start code...

SD3. Mk2b + glass, heated enclosure, GT2 belts, direct drive y shaft, linear bearings, bowden-feed E3D v5 w/ 0.9° stepper
Smoothieboard via Octoprint on RPi

3 Reply by mdrVB6 (edited by mdrVB6 2015-03-30 02:23:13)

  • mdrVB6
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Re: Cura is putting a large retraction right before the start of my print?

That seems... highly likely, thank you!  Getting to bed soon but I will try it and report tomorrow.

I deleted the entire start G-code since it was doing other things that I didn't need.  I also have no start G-code in slic3r, I just manually home everything so I assumed I didn't really need to zero the extruder in Cura either.  I always manually prime the extruder so that could very well be it.

SD4 w/ RUMBA, E3D Volcano, all bearings, glass bed