Bug fix: avoid crossing perimeters #10185

RF47 · 2025-07-20T16:46:16Z

This pull request partially addresses the issue described in #5217.

Problem:
At the end of a perimeter, after retraction, the following travel move does not respect the restriction that prevents crossing other perimeters.

Notes:

Works best when using Arachne perimeter generator.

Spiral Z-hop should be avoided for better results.

Tests

this PR may close #5217
this PR may close #9770

Hammerfest · 2025-07-20T19:40:23Z

This, this is one i have to test, annoying issues with crossing walls and ABS on RC model airplane wheel mounts

gaaat98 · 2025-07-21T12:42:37Z

This is really nice! Does it also avoid crossing support perimeters? Currently enabling z-hop is the only way to avoid hitting supports during travel in certain situations (e.g. #2976)

RF47 · 2025-07-21T12:58:43Z

This is really nice! Does it also avoid crossing support perimeters? Currently enabling z-hop is the only way to avoid hitting supports during travel in certain situations (e.g. #2976)

I don't think so, i do not modify the logic, just avoid perimeters of the part.

pi-squared-studio · 2025-07-21T14:15:27Z

It would be a good idea to reduce the travel speed to a minimum if this crossing happened. This is also true for moving over the infill. I noticed that high speed can knock the model off the bed with a large kinetic impact on the curved-up edge, if there is one. At low speed, the hotend will simply melt its path through.

Noisyfox · 2025-07-22T13:30:33Z

Could you provide some test projects? Thanks

RF47 · 2025-07-22T13:55:38Z

Could you provide some test projects? Thanks

I'm at the office right now and don't have access to my PC, but you can download the example from (bambulab/BambuStudio#6597).
For it to work properly, you have to switch the lamination mode to arachne and change the z hop spiral to normal mode.
When I get home, I'll attach another model.

@ianalexis can you upload an example project?

ianalexis · 2025-07-22T14:03:48Z

avoid crossing test.zip
@Noisyfox See back from the piece.
Before

after

Noisyfox · 2025-07-22T15:32:22Z

I think the place that caused this issue is this line:

OrcaSlicer/src/libslic3r/GCode.cpp

Line 6081 in 7f27c9b

if (needs_retraction

BBS has this removed in bambulab/BambuStudio@e9b7006

Update: seems this alone doesn't solve the issue.

RF47 · 2025-07-22T15:45:36Z

I think the place that caused this issue is this line:

OrcaSlicer/src/libslic3r/GCode.cpp

Line 6081 in 7f27c9b

if (needs_retraction

BBS has this removed in bambulab/BambuStudio@e9b7006

Update: seems this alone doesn't solve the issue.

The problem occurs right after retraction, when it performs the travel move. Should we try with retraction disabled?

ianalexis · 2025-07-22T18:05:14Z

Something i found is that it will "cross" perimeters when moving to wall seam (to start printing it) if infill first or if moving to new layer.

Even if this is not crossing the actual layer wall, will generate undesirable movement and wall artifacts.

RF47 · 2025-07-22T20:57:56Z

prusa slicer has the same issue with one perimeter

RF47 · 2025-07-22T21:09:46Z

with 2 perimeters works almost perfect

test avoidcross 2.zip

RF47 · 2025-07-22T21:23:11Z

one perimeter, different orientation

Noisyfox · 2025-07-23T12:58:25Z

So there are actually 2 problems that led to this issue:

this line as mentioned above:

OrcaSlicer/src/libslic3r/GCode.cpp

Line 6081 in 7f27c9b

if (needs_retraction
This line here:

OrcaSlicer/src/libslic3r/GCode.cpp

Line 4383 in c8a2771

m_writer.set_current_position_clear(false);

when inserting timelapse gcode, which makes the current position unknown (even if the gcode does nothing) when start printing the infill, and not passing this check:

OrcaSlicer/src/libslic3r/GCode.cpp

Line 6085 in c8a2771

&& m_writer.is_current_position_clear()) {

which led to the avoid_crossing_perimeters been ignored at the begining of the infill.

I even reproduced the issue on latest beta BBS (2.2.0.60 when writing this) with their multiple attempts to try to solve this issue:

Few key options that contributes to this problem (on BBS):

printer structure is I3
avoid crossing wall on
no wipe tower
(Optional) having infill density low so the begining of the infill is far away from the seam

Noisyfox · 2025-07-23T13:22:02Z

The problem went away when I set the structure to something other than I3.

NOTE: specific to this project with its current settings. Others may vary.

RF47 · 2025-07-23T13:22:41Z

with print infill first, and seam position back, the same issue:

Noisyfox · 2025-07-23T13:25:04Z

You're right, this option doesn't matter.

Noisyfox · 2025-07-23T13:26:54Z

Just to clearify, my post above is not the whole picture. There might still be other cases that could cause the path planner to stop working unexpectedly.

RF47 · 2025-07-23T13:30:27Z

The problem with the i3 geometry is key.
It works well with other geometries.
I tested these models in Prusa Slicer and Super Slicer, and with a single perimeter, the only one that worked well was Super Slicer.

Noisyfox · 2025-07-23T13:32:44Z

Yeah because need_insert_timelapse_gcode_for_traditional is true only when structure is I3, which then leads to the set_current_position_clear(false) call and breaks path planner.

Noisyfox · 2025-07-23T13:35:42Z

One (partial) solution is to skip this block when timepals_gcode is empty:

OrcaSlicer/src/libslic3r/GCode.cpp

Lines 4382 to 4390 in c8a2771

    
           gcode += timepals_gcode; 
        
           m_writer.set_current_position_clear(false); 
        
           //BBS: check whether custom gcode changes the z position. Update if changed 
        
           double temp_z_after_timepals_gcode; 
        
           if (GCodeProcessor::get_last_z_from_gcode(timepals_gcode, temp_z_after_timepals_gcode)) { 
        
               Vec3d pos = m_writer.get_position(); 
        
               pos(2) = temp_z_after_timepals_gcode; 
        
               m_writer.set_position(pos); 
        
           }

and combined with the removal of this line

OrcaSlicer/src/libslic3r/GCode.cpp

Line 6081 in 7f27c9b

if (needs_retraction

Though for caese that have non-empty timelapse gcode (even just comments) will still trigger this bug.

RF47 · 2025-07-23T22:41:06Z

You are right:
I test these changes:

                            std::string timepals_gcode = insert_timelapse_gcode();
                            gcode += timepals_gcode;
                            if (!timepals_gcode.empty()){
                            m_writer.set_current_position_clear(false);
                            //BBS: check whether custom gcode changes the z position. Update if changed
                            double temp_z_after_timepals_gcode;
                            if (GCodeProcessor::get_last_z_from_gcode(timepals_gcode, temp_z_after_timepals_gcode)) {
                                Vec3d pos = m_writer.get_position();
                                pos(2) = temp_z_after_timepals_gcode;
                                m_writer.set_position(pos);
                            }
                            }

Changes in if (needs_retraction
has no effect.

Without timelapse gcode works:

With timelapse gcode:

But there is also the problem when there is only one perimeter:

RF47 · 2025-07-23T22:52:32Z

0,5 line width:

1.4 line width:

Noisyfox · 2025-07-24T01:07:55Z

Yeah I think that might be a different problem. I'll take a look soon.

Noisyfox · 2025-07-24T09:34:23Z

0,5 line width: 1.4 line width:

I believe this issue is actually caused by #2659

The reason being, in that PR, in order to avoid leaving scars on the outer perimeter when travalling along it, the new code will shrink the obj contour for some amount, so the path will be planned more inside the object. However since we do that, when the wall is thiner than the shrink offset, our travel will be detected as outside of the object, and do not need to avoid the perimeter:

Here is the original perimeter (green) and the travel path (blue):

Here is the perimeter after the shrink and the travel path:

As you could see, now the travel path is completely outside the object, hens no need to detour.

And since this change was cherrypicked from PrusaSlicer, the same issue occurs in PS as well.

RF47 · 2025-07-24T15:23:42Z

I have drafted a quick PoC here which you could take a look: #10220

I can't compile right now, but I'll run tests when the binaries are available.

src/libslic3r/GCode.cpp

avoid crossing perimeters Timelapse issue Update GCode.cpp Update GCode.cpp Update GCode.cpp Update GCode.cpp

RF47 · 2025-07-27T03:24:00Z

This is a compromise within avoid crossing walls not perfect, but it allows wall avoidance as long as no time-lapse G-code is inserted.
This code went back and forth in #4631, #6845, and since it's unpredictable whether or not the gcode can modify the nozzle position, I think it's better to play it safe.

src/libslic3r/GCode.cpp

Update GCode.cpp

src/libslic3r/GCode.cpp

Update GCode.cpp

Noisyfox

LGTM, thanks

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Fixes SoftFever#10188 * Avoid cross perimeter improvements ported from BBS (SoftFever#10220) * FIX: fix avoid crossing perimeters not work[github issue SoftFever#6597] jira: STUDIO-11682 github: SoftFever#6597 Change-Id: Ib86fac93280504e0040f1cce44dad4d02f709c01 (cherry picked from commit 35afceb9a7f4e5a3baba97f054d0e6768e4f59cf) * FIX: optimize avoid crossing wall jira: STUDIO-11682 Change-Id: I49b6756a5d3aeb482c019813074d8f6f9cc3c6ef (cherry picked from commit e9b7006db994d78b9153dedfd0f89447c941cb76) * Sync with latest BBS code --------- Co-authored-by: huicong.li <huicong.li@bambulab.com> * Revert "Refactor stagger concentric seams (SoftFever#6432)" This reverts commit bd8c2ff. * Revert "Stagger concentric infill seams. (SoftFever#6184)" This reverts commit 0286c36. * Add 0.6/0.8 nozzle for tiertime printer. 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RF47 changed the title ~~BUG FIX avoid crossing perimeters~~ Bug fix: avoid crossing perimeters Jul 20, 2025

RF47 mentioned this pull request Jul 20, 2025

"Avoid crossing walls" feature not working. #5217

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Avoid crossing wall not working for first travel move in layer unless retracted bambulab/BambuStudio#7452

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Avoid cross perimeter improvements ported from BBS #10220

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Intec-bambu mentioned this pull request Jul 29, 2025

Avoid Crossing Walls isn't actually respected bambulab/BambuStudio#7240

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ianalexis mentioned this pull request Aug 1, 2025

Wiki Update 9 - Speed #10173

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RF47 commented Jul 22, 2025

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ianalexis commented Jul 22, 2025

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RF47 commented Jul 22, 2025

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RF47 commented Jul 22, 2025

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RF47 commented Jul 22, 2025

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RF47 commented Jul 22, 2025

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Noisyfox commented Jul 23, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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RF47 commented Jul 23, 2025

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Noisyfox commented Jul 23, 2025

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RF47 commented Jul 23, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Noisyfox commented Jul 23, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Uh oh!

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RF47 commented Jul 23, 2025

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RF47 commented Jul 23, 2025

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Noisyfox commented Jul 24, 2025

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Uh oh!

Uh oh!

RF47 commented Jul 24, 2025

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RF47 commented Jul 27, 2025

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Uh oh!

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RF47 commented Jul 20, 2025 •

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ianalexis commented Jul 22, 2025 •

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RF47 commented Jul 23, 2025 •

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Noisyfox commented Jul 24, 2025 •

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