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First Layer Bubbling(?) in same spot on print bed  

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SteveC
(@stevec)
Active Member
First Layer Bubbling(?) in same spot on print bed

Hello All!

I've been printing for 2 years now on (2) MK3S+ units and I've never had this issue!

Started last night using the black PETG. Tried gray and had same issue.

Material: Polymaker PETG Black & Gray. Both rolls have been thoroughly dried overnight at 55deg.

Settings: Nozzle 230deg. Bed 85deg. 

I'm using purple disappearing glue stick. (Have had great results with this in the past.)

I've "temp gunned" the bed all around. In the area that's "bubbling" there's a slight lower temp (75deg) than the rest of the bed.

The MK3 S+ units are old. Around 3-4 years old and have never had the heating units in the bed changed.

Is this a bed temp issue? If so, do I have to replace ALL the heating elements?

I have a project due in 4 days and I have to get this fixed! Any help would be repaid with links to your channels or websites!

Steve (ye ole grognard engineer) Cornette

 

 

 

 

 

Dieses Thema wurde geändert Vor 8 months von SteveC
Veröffentlicht : 15/03/2024 3:29 pm
Bob
 Bob
(@bob-2)
Reputable Member
RE: First Layer Bubbling(?) in same spot on print bed

When I see this kind of lifting I chalk it up to poor adhesion, most likely a dirty spot on the bed.

Cheers

-Bob

Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit with Bondtech heat break, Prusa I3 Mk3s+ kit

Veröffentlicht : 16/03/2024 5:25 pm
Diem
 Diem
(@diem)
Illustrious Member

Almost certain to be fingerprints or a similar grease spot.  Also: if that's PETG you are using too much seperator on the print sheet, if it's PLA - you don't need any.

Cheerio,

Veröffentlicht : 16/03/2024 5:36 pm
Bob
 Bob
(@bob-2)
Reputable Member
RE: First Layer Bubbling(?) in same spot on print bed

 

Posted by: @diem

Almost certain to be fingerprints or a similar grease spot.  Also: if that's PETG you are using too much seperator on the print sheet, if it's PLA - you don't need any.

Cheerio,

Good point, I don't use glue stick or any other separator.  I do find that the textured surface works best with PETG though I can and have gotten good prints with the smooth surface.  Textured provides good adhesion during the print and allows the print to practically jump away after cooling.

Cheers

-Bob

Prusa I3 Mk2 kit upgraded to Mk2.5s, Ender3 with many mods, Prusa Mini kit with Bondtech heat break, Prusa I3 Mk3s+ kit

Veröffentlicht : 16/03/2024 5:42 pm
Zappes
(@zappes)
Reputable Member
RE: First Layer Bubbling(?) in same spot on print bed

Use the satin sheet. It's just perfect for both PLA and PETG.

My models on Printables
Veröffentlicht : 16/03/2024 7:16 pm
SteveC gefällt das
SteveC
(@stevec)
Active Member
Themenstarter answered:
RE: First Layer Bubbling(?) in same spot on print bed

The plot thickens..

Thanks everyone for replying but after printing a similar part on the same bed it's not bed adhesion. I thought it

might be the fact my first layer is at 0.35mm but it's not that.

*And @zappes, yes! I prefer the satin sheet for PETG but that's not an option for this project.*

Here's what I'm finding out..  

Why would a normally flat part have this tiny strip when trying to pick the build plate side?

Normally the cloudy white graphic covers much of the surface that you want on the build plate

but in this case its not. It's a small strip. While the successful part has a graphic that nearly

covers the build plate side.

I've since redesigned the part. Added faux lightening areas just to see if I can avoid this issue.

 

Any other ideas folks? I'm all ears and eyes!

Veröffentlicht : 16/03/2024 9:33 pm
Diem
 Diem
(@diem)
Illustrious Member
RE: First Layer Bubbling(?) in same spot on print bed

might be the fact my first layer is at 0.35mm but it's not that.

Hmm, but that would make the effect worse...

Why would a normally flat part have this tiny strip when trying to pick the build plate side?

And that suggests odd geometry.

Save your project as a .3mf file

Files > Save Project as

Zip the .3mf and post it here. It will contain both your part and your settings for us to diagnose.

Cheerio,

Veröffentlicht : 16/03/2024 11:34 pm
SteveC
(@stevec)
Active Member
Themenstarter answered:
RE: First Layer Bubbling(?) in same spot on print bed

I took over 30 mins this morning writing a long reply only to have a server error. 🙁

I fixed the print by changing the geometry.

Posting a google drive link to the files.

Thanks for taking the time to review! Hopefully, others will benefit from this weird situation!

https://drive.google.com/file/d/140NoGpxP1KmNAHtYT3AKaZqBhehIDRG7/view?usp=drive_link

Steve C.

Veröffentlicht : 17/03/2024 11:20 pm
Diem
 Diem
(@diem)
Illustrious Member

That's locked behind a log-in wall.  Zip the files and add them here.

Cheerio,

Veröffentlicht : 18/03/2024 12:04 am
SteveC
(@stevec)
Active Member
Themenstarter answered:
RE: First Layer Bubbling(?) in same spot on print bed

https://drive.google.com/file/d/140NoGpxP1KmNAHtYT3AKaZqBhehIDRG7/view?usp=sharing

Veröffentlicht : 18/03/2024 12:41 am
Diem
 Diem
(@diem)
Illustrious Member

OK, a fix is a fix.  I suggest cubic fill would add rigidity&stability.

I presume this is constrained to fit something not originally designed for 3D printing.  I stand with the first diagnosis - grease on the print sheet.

Cheerio,

Veröffentlicht : 19/03/2024 1:51 am
SteveC
(@stevec)
Active Member
Themenstarter answered:
RE: First Layer Bubbling(?) in same spot on print bed

Thanks for replying. 👍 

This part represents a dimensional check fixture. A plastic version of an industrial drill jig. It's not going to undergo any stress. It's just used to check dimensions on previously drilled parts. I usually use adaptive cubic infil to save material and give some amount of Strength. 

As for the printing issues... 

It's mirrored half has no issues with how prusa slicer places it onto the build plate nor did its mirror half have issues sticking to the build plate. As for grease on the build plate, I always wash off the glue stick that I use with Ivory brand soap & water, then I give it a good spraying with 90% isopropyl alcohol. So there's no reason to believe grease or oils are the culprit. 

It's either bad geometry that's imparting into the gcode or there's a cold spot in that area of the heat bed that "sometimes" manifests itself. 

Those are the only 2 possibilities that I can think of. 

Thanks for reviewing the files diem.

Cheers sir. 

Veröffentlicht : 19/03/2024 7:24 am
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