Overhang perimeter blobs

Kaelum commented 1 year ago

Description of the bug

While attempting to print the Voron Design Cube my printer would abort with the following error at layer 29 no matter what chances I made to the Print profile:

Move exceeds maximum extrusion (11.310mm^2 vs 0.640mm^2)
See the 'max_extrude_cross_section' config option for details

Since the 11.310mm^2 number is so high, the only possibility is bad slicing, so I looked at the code and saw this:

;TYPE:Overhang perimeter
;WIDTH:4
;HEIGHT:4
G1 F95.493
G1 X260.323 Y264.916 E8.96522
G1 E-1 F2400
G1 Z6 F9600
G1 X252.543 Y242.8
G1 Z5.8
G1 E1 F2400

Which is definitely the offending code. Here is a picture of what was sliced, and it is the blue blobs that are the issue:

I couldn't find any setting for "Overhand perimeter", which I have never seen before, and is the problem.

Project file & How to reproduce

Attempt to print the "Voron Design Cube v7" with 0.2mm layer heights, and 100% infill (doing this as I found another bug), and you will see these blobs.

Voron_Design_Cube_v7 PrusaSlicer.zip

Checklist of files included above

[X] Project file
[X] Screenshot

Version of PrusaSlicer

Version 2.6.0-alpha6+win64

Operating system

Windows 10

Printer model

Rat Rig V-core 3.1 500 & Enter 5 Plus

neophyl commented 1 year ago

Without an attached project file anything is just a guess but you can check and turn off the thick bridges option of it’s on.

Kaelum commented 1 year ago

@neophyl you were close, it was the Detect bridging perimeters that was causing the issue. If I turn off Thick bridges, I can't even slice it. I get a Invalid spacing supplied to Flow::with_spacing() error, and it looks like the print is hollowed out. I'll add a project file to the original post.

HitLuca commented 1 year ago

Having the same issue with the same error as @Kaelum if I disable the relevant option. In my case the issue popped up as I migrated my SuperSlicer profiles to PrusaSlicer in order to try out organic supports. The bridge flow ratio setting was set to 90 instead of 0.9, which causes the Invalid spacing supplied. Fixing that solves the issue

prusa3d / PrusaSlicer