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Unexpected gaps printing PETG  

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mango
(@mango)
Active Member
Unexpected gaps printing PETG

Hi,

I am trying to print this Prusa MINI Z-axis brace REMIX directly from the supplied GCODE and I'm getting gaps in the top few layers of the lower section shown here.

I don't see these in photos from others. 

What am I doing wrong? Should I try to re-slice from the STL myself?

PETG print with gaps

Best Answer by Swiss_Cheese:

@mango

That is absolutely a possibility. A stable surface is impotent, however I would still check to make sure all the belts, screws, and grub screws are properly tightened. even if the printer is brand new and preassembled.

 

Regards

 

Swiss_Cheese

Publié : 20/02/2022 12:29 am
mango
(@mango)
Active Member
Topic starter answered:
RE: Unexpected gaps printing PETG

(This is on a Mini+ that I've been using to print PLA and I'm using Prusament PETG with default temperature and printer settings.)

Publié : 20/02/2022 7:38 am
FoxRun3D
(@foxrun3d)
Famed Member
RE: Unexpected gaps printing PETG

In 99.9% of cases I would always reslice, to make sure the print is optimized for my printer and my filament. The holes could be a simple matter of underextrusion. Make sure your extrusion multiplier is correctly calculated. You could also play with extrusion width.

Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...

Publié : 20/02/2022 11:44 pm
mango a aimé
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: Unexpected gaps printing PETG

your holes aren't round you might want to look at the over all tightness of your screws belts and grub screws.

The Filament Whisperer

Publié : 21/02/2022 2:18 am
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languer
(@languer)
Estimable Member
RE: Unexpected gaps printing PETG

Also, from what I have read PETG is more hygroscopic than PLA and moisture does have some correlation to stringing so perhaps look at drying the PETG some (either with extra desiccants in a bag or dehydrator) prior to printing again. 

Publié : 21/02/2022 2:39 am
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mango
(@mango)
Active Member
Topic starter answered:
RE: Unexpected gaps printing PETG

Could the holes not being round also be caused by printing on a slightly unstable table? I ask because I moved the printer onto a cart and it has a slight wobble.

Posted by: @swiss_cheese

your holes aren't round you might want to look at the over all tightness of your screws belts and grub screws.

 

Publié : 21/02/2022 2:48 am
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: Unexpected gaps printing PETG

@mango

That is absolutely a possibility. A stable surface is impotent, however I would still check to make sure all the belts, screws, and grub screws are properly tightened. even if the printer is brand new and preassembled.

 

Regards

 

Swiss_Cheese

The Filament Whisperer

Publié : 21/02/2022 3:31 am
mango a aimé
mango
(@mango)
Active Member
Topic starter answered:
RE: Unexpected gaps printing PETG

Thank you for the help everyone. For future new users that come across this thread, I'll post what I've learned so far.

I started with calculating the extrusion multiplier as fuchsr suggested and I saw that the top is not smooth on the test cube.

However, before I continued, I saw Swiss_Cheese pointed out that the screw holes were not round and that I should check belt screws and also tension. The grub screws were tight, but I found that the Y-axis belt was very loose. With very little pressure, it was easy to bend.

I printed the Prusa Tension Meter and was able to correct the tension.

Tomorrow, I will return to adjusting the extrusion multiplier after I verify that circles can be correctly printed.

Also, thank you to languer for the reminder about PETG and moisture. I have the filament stored with desiccants just in case.

Publié : 22/02/2022 5:56 am
mango
(@mango)
Active Member
Topic starter answered:
RE: Unexpected gaps printing PETG

To close out this thread: Swiss_Cheese's guidance turned out to be the problem (even though it was a brand new, pre-assembled printer)

Fixing the loose Y-axis belt resolved all of the issues with gaps. After getting the belt to the correct tension, the gaps are gone and my prints are dramatically improved.

Thanks again everyone, I learned a LOT from you all and the process of fixing this.

Publié : 23/02/2022 8:12 pm
Thrillho et languer ont aimé
Swiss_Cheese
(@swiss_cheese)
Noble Member
RE: Unexpected gaps printing PETG

@mango

 

I glad you were able to get things sorted, and thank you for concluding the thread with your findings that's always welcome.

 

Enjoy

 

Swiss_Cheese

The Filament Whisperer

Publié : 23/02/2022 9:01 pm
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