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Ultimaker / Cura

3D printer / slicing GUI built on top of the Uranium framework
GNU Lesser General Public License v3.0
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[4.5.0] Slicer generates z-jumps / switches layer to build plate in mid print #7412

Open mnemocron opened 4 years ago

mnemocron commented 4 years ago

Application version 4.5.0

Platform Windows 10 Pro 1903

Printer Anet A8

Reproduction steps

  1. use file arm_part_2.stl (see project file)
  2. Select bottom surface to stick to build plate
  3. Rotate part by 45° on the y-Axis
  4. Slice, using the default "Fine 0.1mm" Profile
  5. Review in the "Preview" Tab

Screenshots image

image

Actual results The slicer shows that an intermediate layer is to be printed on the ground plane. The print head would knok the wip-print off the bed.

Expected results Continuous upwards layer transition from ground plane (z=0)

Project file CFFFP_arm_part_2.zip

Log file cura.log

Additional information It is difficult to reproduce. I wasn't able to by following the top steps. I changed the profile to a different one (Keep customization), sliced, turned out fine. Changed back to "Fine 0.1mm", sliced and now it suddenly didn't show the artifacts.

Nevertheless, I wanted to let someone know that this happened. I only noticed because I am using a color palette for the preview. If it was all yellow, someone might not see this.

Ghostkeeper commented 4 years ago

I've seen this issue many times. It's not actually printing there though. It's only a visual glitch. You can verify this by saving the g-code to a file and loading it back in. The problem should be gone then. Or you can simply restart the slice (e.g. check/uncheck one setting or something).

The problem is somewhere in that the frond-end forgets the Z coordinate of one layer or the back-end forgets to send it, and it'll take a Z coordinate of 0 then. Only it happens VERY rarely. For me, working full-time as Cura developer, I see this maybe once a month. That makes it very hard to debug this issue.

fvrmr commented 3 years ago

Reproduction steps of this issue: https://github.com/Ultimaker/Cura/files/5789052/MissingZLayers.zip

fieldOfView commented 3 years ago

This is actually a duplicate of https://github.com/Ultimaker/Cura/issues/3815 which was never fixed

fvrmr commented 3 years ago

We have a ticket on our backlog for this issue. Developers see CURA-7960.

This is actually a duplicate of #3815 which was never fixed

We will leave this ticket open since in this ticket is linked to our ticket on our backlog.