RE: Mitigate wall bulge
Good job Prusa team !!and thanks Cura teams !
RE: Mitigate wall bulge
Sorry @rinkel, I seem to have got a bit confused now...
Are you suggesting that when sliced with Prusa Slicer 2.5.0 alpha 2 with or without a new option? the bulge is not there/improved?
RE:
It seems this issue have been on their radar for awhile now and this new Arachne perimeter option will give much better results.
however.....
i only tested my own test object... please feel free to test yours.
(and leave the "detect thin walls" option off)
Sorry @rinkel, I seem to have got a bit confused now...
Are you suggesting that when sliced with Prusa Slicer 2.5.0 alpha 2 with or without a new option? the bulge is not there/improved?
RE: Mitigate wall bulge
This new option (Print settings - Layers and Perimeters) will give you the choice: Classic or Arachne.
Arachne is the new one from Cura and makes the bulge dissappear (in my testobject)
RE: Mitigate wall bulge
Can you tell what it does other than fix the bulge?
RE: Mitigate wall bulge
Read the release notes
https://github.com/prusa3d/PrusaSlicer/releases/tag/version_2.5.0-alpha2
Its got explanations and example pictures etc.
RE: Mitigate wall bulge
I'll quote the first bit from the release notes:
The 'classic' strategy for calculating perimeter extrusion paths is to offset contours of an object slice inwards by a constant extrusion width, one offset per perimeter. This was also the default algorithm in previous PrusaSlicer versions. However this simple algorithm does not handle thin regions well, as reported in these issues. Namely, thin regions cannot be filled with an integer number of fixed width extrusion lines. The classic way of handling narrow regions is to either not generate the innermost perimeter that does not quite fit, but to fill the remaining region with a gap fill algorithm, or to over-extrude the innermost perimeter. None of the two approaches are ideal: The gap fill may produce short segments of widely differing extrusion rates, while over-extruding may produce bulges on thin walls.The developers of Cura recently implemented a new strategy named Arachne based on paper [Kuipers et al., 2020]. The Arachne generator produces perimeter loops and gap fills with varying extrusion width in such a way, that the slice area is filled without underflows and overflows with possibly continuous paths while respecting minimum / maximum extrusion width limits. The Arachne perimeter / gap fill generator really shines on objects with thin walls as thin boxes or labels.
In this PrusaSlicer version, we have ported the Arachne engine from Cura while keeping the old perimeter generator as an option. We made the Arachne perimeter generator default in our printer profiles. Thanks again to Ultimaker for developing Cura under open license
RE: Mitigate wall bulge
AH I found a part that it does not work ... ^^ Huge difference between Prusa & Simplify3D
PRUSA
Simplify3D PERFECTRE: Mitigate wall bulge
Is that with the 2.5.0 ?
AH I found a part that it does not work ... ^^ Huge difference between Prusa & Simplify3D
RE: Mitigate wall bulge
I'm installing the Alpha right now and test! This is going to be the best release of the slicer in years! Awesome to see the Cura team allowing the use of the algorithm !
RE: Mitigate wall bulge
Yes :s
RE:
That's a bit unexpected.
I've created some similar design with a 3 wall (2 and a bit) to replicate.
Printing now in 242
@erlis-vidal
I totally agree.
Don't cheer too soon though. Try it out first with one of your failing objects.
RE: Mitigate wall bulge
ahhhh SOLVED with 4 perimeters 😀 PERFECT
RE:
That should not matter...
Printing your object now in 242 (2 perimeters)
Could not quickly reproduce it with my own design.
ahhhh SOLVED with 4 perimeters 😀 PERFECT
RE: Mitigate wall bulge
everything fine for me 😀 Nice works ! Best upgrade
RE: Mitigate wall bulge
it worked. I don't know why ... Maybe with 4 perimeters, we don't fall on bastard values that allow the layers to fall just .... no idea
RE:
I can reproduce it with your object.
It seems that this object has a wall, 2 shells with infill in between.
This is different from my object, which was 2 shells with half a shell in between.
Now printing in 250
RE: Mitigate wall bulge
my printer is busy now with a 9hr print but I'll test as soon as it finished
RE:
@sujetrandom
I think the issue with your object is a bit different. It has perimeters with an infill.
I, personally think this is the same issue as the infamous Benchy Hull Line.
The bad news is that the fix isn’t universal.And we’re not even sure if such universal fix is physically possible to exist.
It's more about the shrink factor of fully printed layers vs infill.
Good to know that 4 perimeters is solving it for you.
Curious now... will a 4 perimeter benchy show the hull line ??...