Inside vertical wall defects, only one wall, possible causes?
 
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Inside vertical wall defects, only one wall, possible causes?  

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Bruce Labitt
(@bruce-labitt)
Estimable Member
Inside vertical wall defects, only one wall, possible causes?

I printed a lid for a small drill index I created.  It's just a square box, with a few chamfers on the sides.  3mm wall thickness.  Printed with Overture PETG using a 0.25mm brass nozzle.  One of the interior vertical walls have little blobs and things sticking out.  The junk interferes with using it as a lid, so I had to remove some of it.  Why just one interior wall, out of 4, and perfect exterior walls?  It's a beautiful print, besides that one wall.  I'll package up the 3mf shortly.  Here's the interior view.  I put the part on it's side, to take advantage of the lighting.

Any suggestions would be most welcome.  This is the cap that covers the stub machine drills.

Respondido : 04/02/2026 6:35 pm
miroslav.h4
(@miroslav-h4)
Prominent Member
RE: Inside vertical wall defects, only one wall, possible causes?

So first: Why are you using a 0.25 nozzle and a 0.15 layer on a box like this?
Second: Why are you stuffing the prints into the corner of the base instead of holding the parts around the center of the build plate?
Third: Why do you have such thick box walls, and with gyroid filling on top of that?

Recommendation: Use a 0.4 nozzle and a 0.2 SPEED layer. Cover wall thickness max 1.6 mm side perimeters 2. This will stop creating internal filling in the cover walls and the walls will be smooth. However, for the 0.4 nozzle it will be necessary to change the font size or select the "Bold" font style.

Respondido : 04/02/2026 8:15 pm
miroslav.h4
(@miroslav-h4)
Prominent Member
RE: Inside vertical wall defects, only one wall, possible causes?

So first: Why are you using a 0.25 nozzle and a 0.15 layer on a box like this?
Second: Why are you stuffing the prints into the corner of the base instead of holding the parts around the center of the build plate?
Third: Why do you have such thick box walls, and with gyroid filling on top of that?

Recommendation: Use a 0.4 nozzle and a 0.2 SPEED layer. Cover wall thickness max 1.6 mm side perimeters 2. This will stop creating internal filling in the cover walls and the walls will be smooth. However, for the 0.4 nozzle it will be necessary to change the font size or select the "Bold" font style.

Respondido : 04/02/2026 8:16 pm
miroslav.h4
(@miroslav-h4)
Prominent Member
RE: Inside vertical wall defects, only one wall, possible causes?

So first: Why are you using a 0.25 nozzle and a 0.15 layer on a box like this?
Second: Why are you stuffing the prints into the corner of the base instead of holding the parts around the center of the build plate?
Third: Why do you have such thick box walls, and with gyroid filling on top of that?

Recommendation: Use a 0.4 nozzle and a 0.2 SPEED layer. Cover wall thickness max 1.6 mm side perimeters 2. This will stop creating internal filling in the cover walls and the walls will be smooth. However, for the 0.4 nozzle it will be necessary to change the font size or select the "Bold" font style.

Respondido : 04/02/2026 8:17 pm
Bruce Labitt
(@bruce-labitt)
Estimable Member
Topic starter answered:
RE: Inside vertical wall defects, only one wall, possible causes?

 

Posted by: @miroslav-h4

So first: Why are you using a 0.25 nozzle and a 0.15 layer on a box like this?
Second: Why are you stuffing the prints into the corner of the base instead of holding the parts around the center of the build plate?
Third: Why do you have such thick box walls, and with gyroid filling on top of that?

Recommendation: Use a 0.4 nozzle and a 0.2 SPEED layer. Cover wall thickness max 1.6 mm side perimeters 2. This will stop creating internal filling in the cover walls and the walls will be smooth. However, for the 0.4 nozzle it will be necessary to change the font size or select the "Bold" font style.

I have hollow (engraved) text at the bottom surface of the box.  A coarse nozzle yields poor text.  Already have experienced that.

I move individual prints around my build plate, all the time.  That way I only treat the plate once, but I can make multiple prints before having to clean again.  In my experience, it isn't necessary to always be at the center.  Always printing at the center can cause premature wear at that spot.  

No.  A 0.4mm nozzle cannot print 2.5 or 3mm text with any fidelity.  I can show you what it looks like.  Yes it's faster, but the details are poor.

 

I am searching for why all the stuff ends up on the interior wall, pretty much only on one wall.  It's clearly a setting in the 3mf and the filament that I have.  Every version I have printed has it.  I imported step files into PrusaSlicer, not stls.  They should be clean.  The slicer output looks clean, but there's debris on that inner wall that interferes with the fit of the cover.  And it looks bad.

Respondido : 04/02/2026 8:31 pm
Bruce Labitt
(@bruce-labitt)
Estimable Member
Topic starter answered:
RE: Inside vertical wall defects, only one wall, possible causes?

 

Posted by: @miroslav-h4

So first: Why are you using a 0.25 nozzle and a 0.15 layer on a box like this?
Second: Why are you stuffing the prints into the corner of the base instead of holding the parts around the center of the build plate?
Third: Why do you have such thick box walls, and with gyroid filling on top of that?

Recommendation: Use a 0.4 nozzle and a 0.2 SPEED layer. Cover wall thickness max 1.6 mm side perimeters 2. This will stop creating internal filling in the cover walls and the walls will be smooth. However, for the 0.4 nozzle it will be necessary to change the font size or select the "Bold" font style.

I have hollow (engraved) text at the bottom surface of the box.  A coarse nozzle yields poor text.  Already have experienced that.

I move individual prints around my build plate, all the time.  That way I only treat the plate once, but I can make multiple prints before having to clean again.  In my experience, it isn't necessary to always be at the center.  Always printing at the center can cause premature wear at that spot.  

No.  A 0.4mm nozzle cannot print 2.5 or 3mm text with any fidelity.  I can show you what it looks like.  Yes it's faster, but the details are poor.

 

I am searching for why all the stuff ends up on the interior wall, pretty much only on one wall.  It's clearly a setting in the 3mf and the filament that I have.  Every version I have printed has it.  I imported step files into PrusaSlicer, not stls.  They should be clean.  The slicer output looks clean, but there's debris on that inner wall that interferes with the fit of the cover.  And it looks bad.

Respondido : 04/02/2026 8:34 pm
Bruce Labitt
(@bruce-labitt)
Estimable Member
Topic starter answered:
RE: Inside vertical wall defects, only one wall, possible causes?

 

Posted by: @miroslav-h4

So first: Why are you using a 0.25 nozzle and a 0.15 layer on a box like this?
Second: Why are you stuffing the prints into the corner of the base instead of holding the parts around the center of the build plate?
Third: Why do you have such thick box walls, and with gyroid filling on top of that?

Recommendation: Use a 0.4 nozzle and a 0.2 SPEED layer. Cover wall thickness max 1.6 mm side perimeters 2. This will stop creating internal filling in the cover walls and the walls will be smooth. However, for the 0.4 nozzle it will be necessary to change the font size or select the "Bold" font style.

I have hollow (engraved) text at the bottom surface of the box.  A coarse nozzle yields poor text.  Already have experienced that.

I move individual prints around my build plate, all the time.  That way I only treat the plate once, but I can make multiple prints before having to clean again.  In my experience, it isn't necessary to always be at the center.  Always printing at the center can cause premature wear at that spot.  

No.  A 0.4mm nozzle cannot print 2.5 or 3mm text with any fidelity.  I can show you what it looks like.  Yes it's faster, but the details are poor.

 

I am searching for why all the stuff ends up on the interior wall, pretty much only on one wall.  It's clearly a setting in the 3mf and the filament that I have.  Every version I have printed has it.  I imported step files into PrusaSlicer, not stls.  They should be clean.  The slicer output looks clean, but there's debris on that inner wall that interferes with the fit of the cover.  And it looks bad.

Respondido : 04/02/2026 8:46 pm
Bruce Labitt
(@bruce-labitt)
Estimable Member
Topic starter answered:
RE: Inside vertical wall defects, only one wall, possible causes?

Forum is broken, I didn't triple post.

Respondido : 04/02/2026 8:49 pm
miroslav.h4
(@miroslav-h4)
Prominent Member
RE: Inside vertical wall defects, only one wall, possible causes?

I didn't post multiple posts either. I posted it only once, the famous Prusuv server, probably powered by an I486 SX processor, which cannot handle the load, took care of the multiplication. I think Josef should "slap his pocket" and buy something more modern and with proper software for this forum, which currently corresponds to software from the end of the last century.

Respondido : 04/02/2026 10:32 pm
Bruce Labitt
(@bruce-labitt)
Estimable Member
Topic starter answered:
RE: Inside vertical wall defects, only one wall, possible causes?

Any idea why there's crud on the inner wall?  Here's my original index on the left, printed with a 0.4mm nozzle.  The cap, which has an inner wall with zits, in the middle.  Finally, the reprinted index with bigger font, so I can read the drill sizes.

The cap is also printed using a 0.25 nozzle, since I was printing the legend "Metric Stub Drills" and "1.0mm - 2.0mm".  Those letters did not come out well.  I need to use a bold font, and a little larger.  I have already edited my CAD file.  Need to print it, but would like to know if there are any changes that should help in the slicer.

The font is 2.5mm, and not bold.  The filament has smeared inwards, maybe elephant foot.  There are supposed to be decimal points and a hyphen...  The slicer output looks fine, but the print does not.

Respondido : 04/02/2026 10:58 pm
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