Too much of filament for a thin wall.
Hello,
I have problem with prusa-slicer when my model contains thin wall composed from odd numbers of threads. For the demonstration I created small model where half of that model is composed from three threads (width 1.27mm) and then is linearly extended to four threads (width 1.67mm).
A screennshot from the slicer is attached. In this figure is visible 5 lines which create infill in Y shape. The extrusion started in point marked as red A, then continue to point B and continue To C, D, B and back to A. So the filament is extruded twice between A-B: the first time from A to B and then from B to A. In the screenshot are these two lines of gcode marked with red <.
So the printing of thin wall started to stick filament on the bottom of printhead and many lumps are created during printing.
Files scad and stl can't bi attached, so openscad source for the model can be like this:
cube( [ 20, 1.27, 5 ], true ); hull() { cube( [ 1, 1.27, 5 ], true ); translate( [ -10, 0, 0 ] ) cube( [ 1 / 1024, 1.67, 5 ], true );
Thin walls are used as plastic spring in model, not here.
How to avoid this problem?
Thanks, Petr.
Use a much smaller nozzle or SLA.
Cheerio,
RE: Too much of filament for a thin wall.
Can you attach the zipped 3mf file? I used your OpenSCAD code, and I can't replicate the behavior you're seeing.
RE: Too much of filament for a thin wall.
Hello,
here is the required file with model.
I am using slicer version 2.4.2 GTK2 in Kubuntu 20.04.
Petr
RE: Too much of filament for a thin wall.
?
The Filament Whisperer
RE: Too much of filament for a thin wall.
Okay, I think can see the issue now. In step 1153, the tool head runs again over the line it laid down in step 1149 and adds more material.
I was able to avoid it by activating Detect thin walls.
I don't know why the slicer does that. If you consider it it a bug, I'd head over to the Prusa GitHub site and open a ticket, and maybe the devs can explain it.
RE: Too much of filament for a thin wall.
Already reported, several times in fact
https://github.com/prusa3d/PrusaSlicer/issues/7762
https://github.com/prusa3d/PrusaSlicer/issues/7973
as examples. The current response is we have released 2.5 with the arachne perimeter generator which it seems the devs expect to be the fix for this.
RE:
I *knew* our resident GitHub guru would come through! 🙂
I checked the model the OP posted with the 2.5 alpha, and indeed the Arachne engine produces a correct single internal perimeter with varying width.
RE:
You don't need the alpha it's not a bug and you have been able to get the result you need with a properly setup slice, here we go again, every time a new version comes out, you were not limited before, you could always do this cleanly.
Good Luck
The Filament Whisperer
RE: Too much of filament for a thin wall.
Hi!
The "Detect thin wall" helped.
In the version 2.5 is this problem solved automatically.
Thanks for advice.
Petr
RE: Too much of filament for a thin wall.
once again, someone bailed on education for the push of a button. its the new world order. it will come back to haunt you.
Good luck, I'll bet you give up on printing in less then two years.
pfft
Swiss_Cheese
The Filament Whisperer
RE: Too much of filament for a thin wall.
Good luck, I'll bet you give up on printing in less then two years.
pfft
Swiss_Cheese
Nah, in two years Elon will have given us the StarTrek replicator or magic will finally work, so no need to learn a craft properly 😉
SNCR
Hansjoerg