0.6 nozzle PETG spiral mode: problem when spiral initiates
 
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0.6 nozzle PETG spiral mode: problem when spiral initiates  

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sbetak
(@sbetak)
Active Member
0.6 nozzle PETG spiral mode: problem when spiral initiates

Hello Prusa people. 

I am trying to print a PETG object with a 0.6 mm nozzle in spiral mode. 

The print is executing just fine except for the moment when the bottom layers are done, and the spiral mode initiates. 

Immediately following this, the filament kind of blops out creating these bumps. They are flattened out by the following layers but the error is clearly visible:

 

When i look at the g-code, the spiral program starts the line in, what looks to me, in a bit of en awkward position: 

I have tried to edit the g-code directly, to raise the first layer of the spiral mode, but i haven't had much success with that yet.

I realize you will probably ask for all the settings of the print, but i keep changing it around with the same result; different temperatures, no cooling, different layer height, flipping to model upside down etc. 

Has anybody experienced something similar? Suggestions to fix it? 

Thank you very much for your time,

Søren 

Posted : 02/06/2021 11:01 am
Dan Rogers
(@dan-rogers)
Noble Member
RE: 0.6 nozzle PETG spiral mode: problem when spiral initiates

You may get better answers if you zip and attach the sliced file - if they are all failing, posting any of the will do.  First thought is the starting point will be at the previous layer seam.  You can move the seam via the slicer.

Posted : 02/06/2021 11:44 am
sbetak
(@sbetak)
Active Member
Topic starter answered:
RE: 0.6 nozzle PETG spiral mode: problem when spiral initiates

Yes you are probably right, here it is. 

example.gcode

 

Posted : 02/06/2021 12:04 pm
Dan Rogers
(@dan-rogers)
Noble Member
RE: 0.6 nozzle PETG spiral mode: problem when spiral initiates

Sorry, I meant the .3mf from Prusa Slicer after you have sliced it save the project, and upload that.  What is more helpful is seeing the settings that you sliced it with (no, please don't list them, it's a long long scroll)

Posted : 02/06/2021 1:49 pm
sbetak
(@sbetak)
Active Member
Topic starter answered:
RE: 0.6 nozzle PETG spiral mode: problem when spiral initiates

Here is the .3mf file. 

example.3mf

I hope there is a mistake in there somewhere, but it came out like this straight from the preset settings also. 

Has anybody experienced something similar? 

Posted : 02/06/2021 3:30 pm
bobstro
(@bobstro)
Illustrious Member
RE: 0.6 nozzle PETG spiral mode: problem when spiral initiates
Posted by: @sbetak

[...] I am trying to print a PETG object with a 0.6 mm nozzle in spiral mode. 

The print is executing just fine except for the moment when the bottom layers are done, and the spiral mode initiates. 

It looks like you're using a 0.4mm layer height with a 0.15mm 1st layer height. Your bottom minimum thickness is 0.6mm. You might try using a 1st layer height of 0.2mm and bottom thickness of 0.4mm to see if making the bottom an even multiple of your layer height thick helps. I have only done a bit of experimenting with this myself and was looking into similar options. Presumably it prints nicely with no bottom layers, correct?

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 02/06/2021 4:02 pm
sbetak
(@sbetak)
Active Member
Topic starter answered:
RE: 0.6 nozzle PETG spiral mode: problem when spiral initiates

I will try with the first layer height adjustment, so far it hasn't solved it.

No bottom layers - I actually don't know how to do that, i thought spiral mode always began by putting down a few layers before starting. Is it possible to not do this? (no talking about horizontal shell/bottom shell, the objects' bottom is 'open').

 

Posted : 03/06/2021 7:34 am
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