odd slicing behavior

[cbarry]

In v5, just started playing around with it.

Can someone help me understand why the symmetrical stl file is so anti-symmetrical when sliced?
One would think that an anomaly on one tooth would also appear on each tooth, yet almost every tooth has a different type of error. I have a single outline,

Also notice how it handled the gear shaft. It only wants to print 3/4 of the diameter.

-C

[siemslikelynn]

It looks like a mesh issue. Can you attach the STL file that you're working with?

[cbarry]

same small gear in combo with another larger gear. both gears have the exact same tooth 'module' or pitch. basically they are the same tooth, wrapped around different diameters. The larger gear's teeth look fine for the most part.

I've had both the single and double gears printed externally, and investment cast in bronze, and they are fine, so it's not a weird STL thing, as it's the same STL files.

[RandallOfLegend]

What is the size/diameter of that gear? It looks like the teeth are far too small for your nozzle size (0.4?)

[KarlW1000]

Looks like it might have something to do with your coasting or extra restart settings. There is a gap in the large gear which could be at the beginning or ending of extrusion.

[zemlin]

Looks like gaps from coasting.

[S3D-Jason]

Looks like coasting to me as well. Turn on the display of travel movements and that should make it obvious.

[dkightley]

THis has been something in the software for a long time. Its not an error, just simply the way the software "indicates" where coasting is taking place.

The proper solution would be an option on the simulation panel to not show the effect of coasting.

A workaround is to temporarily untick Coast at End in the settings whilst you're wanting to check for symmetry, etc.

I think I raised this as a feature request some years ago!

[siemslikelynn]

Wow that's the coasting visualization? Oof, good to know. I never use it so I'd never have guessed.

[billyd]

You can also get odd results depending on extrusion width, number of perimeters, and single line extrusion setting vs the model and it's smaller features. Sometimes changing one or more of these settings, and/or disabling (or enabling) single line extrusions can result in a dramatically improved (or worse) slice result.