Filament lines where they shouldn't be what causes this?
 
Notifications
Clear all

Filament lines where they shouldn't be what causes this?  

Page 1 / 2
  RSS
Wazoo3d
(@wazoo3d)
Member
Filament lines where they shouldn't be what causes this?

Just the brown I getting these lines where they should not be. I can not figure out why this is happening. Tried increasing the temp that didn't help. Anyone have any ideas. Not sure the exact terminology is for this failure.  It's on XL 5 tool with standard generic PLA settings. Thank you for you help.

 

 

Posted : 08/09/2025 4:01 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Filament lines where they shouldn't be what causes this?

are there any errors in the STL?

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK

Posted : 08/09/2025 4:38 pm
Wazoo3d
(@wazoo3d)
Member
Topic starter answered:
RE: Filament lines where they shouldn't be what causes this?

None that I can see, Prusaslicer not reporting any. I guess I could do a repair anyways see if that works. 

Posted : 08/09/2025 5:09 pm
Wazoo3d
(@wazoo3d)
Member
Topic starter answered:
RE: Filament lines where they shouldn't be what causes this?

I painted the model the colors I wanted brown only one giving me this mess. I painted it using smart fill 1st time, now I went and repainted it with bucket fill see this helps. Not sure if this makes a difference. 

Posted : 08/09/2025 5:13 pm
Tim
 Tim
(@tim-24)
Member
RE:

This is generally from trying to print a round inside radius between two points, the filament just drags along from point to point rather than form the curve you expect. This type of feature must be supported to print properly.

 

E.g., this round part. You might think it would print well, the lid will print fine, but the tower you'll get is a round bottom, followed with layers of octagonal steps. 

This post was modified 2 days ago 2 times by Tim
Posted : 08/09/2025 8:25 pm
Wazoo3d
(@wazoo3d)
Member
Topic starter answered:
RE: Filament lines where they shouldn't be what causes this?

Thanks, how would I support it? If you see the white its not doing it and they are about the shapes. 

Posted : 08/09/2025 10:17 pm
Tim
 Tim
(@tim-24)
Member
RE: Filament lines where they shouldn't be what causes this?

Thought I'd explain a bit more: in this image (stolen from the web) you can the inside radius is not bonding to the part. Usually it's an overhang issue, and the  perimeter doesn't have enough 'shelf' under it to stick properly. Here it's tacking onto a few places, but failing most places, the extrusion just stretches from the contact points like a rubber band. Notice this part starts having issues when print above the center of the V clamp - a simple circular 45 degree overhang. 

Also note the extrusion 'holds on' for the start of the perimeter then as the printer speeds up the filament separates from the part (not enough time to adhere).

Another very common place this happens is inside threads. They often require finer layer heights.

Posted : 09/09/2025 12:21 am
1 people liked
caroline4455
(@caroline4455)
Member
RE: Filament lines where they shouldn't be what causes this?

Those random lines usually come from slight extrusion inconsistencies or toolpath artifacts, especially on multi-tool setups like the XL. With PLA, it could be something as simple as residual filament left on the nozzle tip dragging across the print, or minor oozing between tool changes. You might try tightening up your retraction settings, wiping routines, or even running a quick cold pull to clear any debris.

 

Posted : 09/09/2025 1:00 am
Tim
 Tim
(@tim-24)
Member
RE: Filament lines where they shouldn't be what causes this?
Posted by: @wazoo3d

Thanks, how would I support it? If you see the white its not doing it and they are about the shapes. 

Easiest way to better understand your part is for you to zip the .3mf and post it here.  Then we can see what's underneath the top layer.  I suspect it isn't the same under the white as it is under the orangie color. It could even be as simple as the orange part is floating. 

Posted : 09/09/2025 8:12 am
Wazoo3d
(@wazoo3d)
Member
Topic starter answered:
RE: Filament lines where they shouldn't be what causes this?

Ok, I see thank you. 

Posted : 09/09/2025 2:52 pm
Wazoo3d
(@wazoo3d)
Member
Topic starter answered:
RE: Filament lines where they shouldn't be what causes this?

Thank you, I'll experiment with that. 

Posted by: @caroline4455

Those random lines usually come from slight extrusion inconsistencies or toolpath artifacts, especially on multi-tool setups like the XL. With PLA, it could be something as simple as residual filament left on the nozzle tip dragging across the print, or minor oozing between tool changes. You might try tightening up your retraction settings, wiping routines, or even running a quick cold pull to clear any debris.

 

 

Posted : 09/09/2025 2:53 pm
Wazoo3d
(@wazoo3d)
Member
Topic starter answered:
RE: Filament lines where they shouldn't be what causes this?

 

Posted by: @tim-24
Posted by: @wazoo3d

Thanks, how would I support it? If you see the white its not doing it and they are about the shapes. 

Easiest way to better understand your part is for you to zip the .3mf and post it here.  Then we can see what's underneath the top layer.  I suspect it isn't the same under the white as it is under the orangie color. It could even be as simple as the orange part is floating. 

Ok here is the file. It's a .STL file that ok? Thank you for you help.

obj_1_Assembly

Posted : 09/09/2025 2:57 pm
Tim
 Tim
(@tim-24)
Member
RE: Filament lines where they shouldn't be what causes this?

I'll try looking a bit closer later today, but initially all I can think of is -- and I am hazarding a guess here -- but I suspect you are ordering the colors wrong such that a color that should be printed first as a sublayer isn't being printed, leaving a layer gap under the orange.  Along the lines of swapping from black to orange before the black layer has fully completed.  

Posted : 09/09/2025 5:11 pm
Tim
 Tim
(@tim-24)
Member
RE: Filament lines where they shouldn't be what causes this?

One more favor: zip up the gcode that you are printing and post it.  That might hold more clues.

Posted : 09/09/2025 5:22 pm
Wazoo3d
(@wazoo3d)
Member
Topic starter answered:
RE: Filament lines where they shouldn't be what causes this?

It's the 1st time using this light brown from Kingroon I might try different color see if it does the same or flip flop the black with the brown. I can't see any lift or layer missing with I go layer by layer in prusaslicer. Thank you for your time and help. 1st time I have had something this in a print and couldn't solve it.

Posted by: @tim-24

I'll try looking a bit closer later today, but initially all I can think of is -- and I am hazarding a guess here -- but I suspect you are ordering the colors wrong such that a color that should be printed first as a sublayer isn't being printed, leaving a layer gap under the orange.  Along the lines of swapping from black to orange before the black layer has fully completed.  

 

Posted : 09/09/2025 5:42 pm
Wazoo3d
(@wazoo3d)
Member
Topic starter answered:
RE: Filament lines where they shouldn't be what causes this?

Here is the gcode. PrusaXL-0.4-Jaguars-NecklacePendant3_0.4n_0.2mm_PLA,PLA,PLA,PLA_XLIS_3h15m

Posted by: @tim-24

One more favor: zip up the gcode that you are printing and post it.  That might hold more clues.

 

Posted : 09/09/2025 5:45 pm
Tim
 Tim
(@tim-24)
Member
RE:

And if you can also include the .3mf in a zip, it may also help explain why it's happening (null extruder, etc).

This post was modified 16 hours ago by Tim
Posted : 09/09/2025 6:19 pm
Wazoo3d
(@wazoo3d)
Member
Topic starter answered:
RE: Filament lines where they shouldn't be what causes this?

Ok here it is.. PrusaXL-0.4-Jaguars-NecklacePendant3_0.4n_0.2mm_PLA,PLA,PLA,PLA_XLIS_3h15m

Posted by: @tim-24

And if you can also include the .3mf in a zip, it may also help explain why it's happening (null extruder, etc).

 

Posted : 09/09/2025 7:13 pm
Tim
 Tim
(@tim-24)
Member
RE: Filament lines where they shouldn't be what causes this?

After looking at the Slicer file, I'm guessing tool 4 bed level messed up (nozzle not clean?) or there was an extrusion problem as that color started printing. The result being the second or third layer of orange started printing in the air.  Any chance you recall if the purge tower looked normal? Especially the orange?

In either case, I'd expect the orange bits to pop off the print pretty easily since they are only tacked down in a few places.

To test this theory, in Slicer, cut your part so that there is only the very top layer or two of color, slice it and print it as a multi-color test. If orange isn't sticking, or printing in the air, the culprit is tool 4 or its calibration.

 

ps: One suggestion for future reference, when you want black filament represented for a tool, make it a dark gray; black is nearly useless in the gcode viewer. A dark gray allows looking at the lay up.

Posted : 10/09/2025 12:23 am
Tim
 Tim
(@tim-24)
Member
RE:

Sigh ,,, lol ... make that TOOL3, the one with the orange loaded.   I had to tweak tool 4 color from jet black to gray to examine the layers so it was fresh on my mind.

This post was modified 10 hours ago by Tim
Posted : 10/09/2025 12:36 am
Page 1 / 2
Share: