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Extrusion Width Percentge #4631

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buryboi opened this issue Aug 14, 2020 · 5 comments
Closed

Extrusion Width Percentge #4631

buryboi opened this issue Aug 14, 2020 · 5 comments

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@buryboi
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Version

2.2.0

Operating system type + version

Windows 10 64bit

3D printer brand / version + firmware version (if known)

Artillery Sidewinder X1 / V4 + Marlin bugfix 2.0.x

Behavior

Extrusion Width settings above 300% produce an error popup.

  • Steps needed to reproduce the problem
    Enable Expert Features, Click Print Settings, Click advanced and change any extrusion width to a number above 300%

    • If this is a command-line slicing issue, include the options used
      N/A
  • Expected Results
    At a 0.2 mm layer height, a width of 400% should result in a layer width of 0.8mm as per the hover notes. "If expressed as a percentage it will be computed over layer height." When 300% is used the layer width is correctly sliced at 0.6 mm.

image

  • Actual Results
    An error pops up stating "Excessive extrusion_width=1.6 mm to be printable with nozzle diameter 0.4 mm"

image

Is this a new feature request?
No

Project File (.3MF) where problem occurs

Unable to slice and export until a number below 300% is input in the cell.

@louwheesy
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It says why you can't do that. It's a rediculous extrusion width that cannot be reliably produced. It's not reccommended to print above 150%, although it lets you go to 300%. Defnitely not an issue.

@n8bot
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Contributor

If you pay closer attention to the issue described, he mentions how the tooltip describes the calculation acting over the layer height, when it seems to in fact act over the nozzle width.

@buryboi
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Author

I agree that 1.6 would be ridiculous. But 1.6 mm is 400% of nozzle width not layer height as the tool tip indicates. Using 300% results in a sliced layer width of 0.6 mm which indicates that the actual slicing is done based on layer height as indicated by the tool tip.

To summarize/reiterate: the tool tip indicates percentages will slice based on layer height. The error popping up is slicing based on nozzle width. When reviewing the sliced model, the width is in fact sliced based on layer height not nozzle width. Thus it is opinion that the error is incorrect.

@rtyr
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Collaborator

Yes, it seems like a bug in sanity check (width is calculated over nozzle diameter instead of layer height) .

bubnikv added a commit that referenced this issue Jan 20, 2021
Fixed extrusion width validation logic in case the extrusion width
was specified wrt. layer height.
@bubnikv
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Fixed with 6d7d482.

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