Has anyone thought about printing narrower lines in order to get sharper corners? Once Linear advance or Pressure advance is activated, you don’t get bulging corners anymore… but can we do better?
Has this been implemented anywhere yet? Does it have a name?
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Isn’t this exactly what Pressure Advance does?
Exactly. And the PA tuning that Ellis has is great for tweaking it.
Maybe my sketch doesn’t make it clear. I mean to intentionally make the extrusion narrower and make the print path go outwards to compensate for the narrower extrusion.
Pressure Advance does it. It reduces the extrusion at corners, accounts for coast speed, etc.
The actual extrusion or the extruder input? Of course it will also reduce the extrusion if badly tuned, I guess that’s not the idea though. PA is also needed for straight lines with variable speed. It does help with corners but would need additional path corrections.
As shown in my sketches below:
To my understanding, pressure advance only compensates for non-linearities in the extrusion process. These non-linearities, if not taken into account would thin out the path at the beginning (missing pressure) and lead to an excess of material at the end (excess pressure buildup).
With perfect compensation of these non-linearities but no changes to the target line-width and path, the minimum achievable outer radius is equal to that of the extrusion width. I’m wondering if that minimum radius could not be reduced by progressively reducing the target extrusion width the closer you get to the corner. On top of that you would need to adjust the path towards the outside in order to keep the outer wall straight.
Edit: to my understanding, a classical corner will also result in a buildup of material inside, this can be explained by the nozzle orifice dwelling longer on the inside of the corner. This excess moves to the inside, creating a round corner on the inside as well.
My proposal would also combat this inner excess, thus giving overall sharper corners.
New Lemmy Post: Sharp corner algorithm (https://lemmy.world/post/9687238)
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Not sure what you mean by printing ‘narrower’ lines. The width of a line is going to be set by your nozzle
You can totally extrude both narrower and wider than your nozzle. Heck, if you have a Slic3r based slicer like PrusaSlicer, Orca, SuperSlicer, etc and your extrusion width is expressed as a percentage, that percentage is a percentage of layer height - NOT nozzle diameter.
If you’re using 0.2mm layers, your extrusion with is expressed as a percentage, and you’re using a 0.4mm nozzle your extrusion with is less than your actual nozel diameter.
I print most of my prints with a 0.4mm nozzle and 0.6mm extrusion width.
Nonesense. It’s a combination of the amount of material extruded and the layer thickness.
So you would need different later heights around the edges just to stack those ever thinner lines? How do you think this will interact with the rest of the print?
