Cura 4.3 deliberate zit during retraction travel

[td1 0]

Hi experts! I sure could use a hand here please. I was trying to tune out some very repeatable zits, only in the end did I look at the tool path preview. Low and behold there is indeed tiny yellow dot outside the wall exactly where my zits are! The move itself is a bit weird - why not travel directly to destination ? I can also observe the zit being extruded using http://gcode.ws/

 

In the attached, watch layer 14. Happens on loads of layers, but not every layer, e.g layer 17.

 

I'm out of my depth here! Kindly advise.

 

Thanks

Tim

retraction test - cylinder.3mf retraction test - cylinder (1).stl

Edited October 6, 2019 by td1

[burtoogle 493]

Hello @td1, I think what is happening there is that the cylinder is being printed as a thin wall and the Ultimaker Cura implementation of thin walls has a tendency to include little jaggies like you are seeing.

 

I produce my own Cura builds and they use a different implementation of thin wall printing (along with lots of other tweaks and bug fixes) and they handle this particular model better as you can see here.

 

 

My builds can be installed alongside the Ultimaker releases without conflict. You can find them along with a README that describes what's different here https://www.dropbox.com/sh/s43vqzmi4d2bqe2/AAADdYdSu9iwcKa0Knqgurm4a?dl=0