Print quality - PETG with IS - Input Shaper (MINI)

RE: Print quality - PETG with IS

Zappes — Thu, 08 Feb 2024 07:58:31 +0000

Oh, my settings are for the MK4, I just now realized you have a Mini. I don't know the proper absolute values for that device, but the general idea of reducing the setting seems transferable. :)

RE: Print quality - PETG with IS

Zappes — Thu, 08 Feb 2024 07:57:18 +0000

@toddg: Yes, I meant retraction. The stock Prusament PETG profile has an override for that which sets it to 0,8mm:

0,8mm is OK for most prints, but when you get little blobs where the extruder stops extruding, it's a great idea to reduce this. I had very good results with 0,2mm for my rather tricky minimal gridfinity bins.

RE: Print quality - PETG with IS

Brian — Wed, 07 Feb 2024 23:41:57 +0000

That's a lot of retraction, with dry filament .8 is plenty.

I took the prusament PETG profile and updated the filament diameter to match what I measured on the actual roll of material and updated the extrusion multiplier to get exactly a .45mm wall. You can check this by printing a 20x20mm cube in vase mode.

One other thing to update is the volumetric flow rate for the brand of petg your using, they are not all the same. For example Hatchbox PETG volumetric flow rate is 2x that of Polymaker Polylite PETG.

With those updated settings on the Prusament PETG profile my prints turn out as good or better than my PLA prints.

RE: Print quality - PETG with IS

ToddG — Wed, 07 Feb 2024 21:02:40 +0000

Do you mean "lift" or "retraction"?

Because my retraction is way more than 0.8...

RE: Print quality - PETG with IS

Zappes — Sun, 04 Feb 2024 10:43:06 +0000

You might want to play a bit with the retraction setting, that can fix similar issues sometimes. I had a similar situation and reducing the retraction from 0.8mm to 0.2mm fixed it then - ymmv.

RE:

ToddG — Sat, 03 Feb 2024 21:35:58 +0000

both of those spots are after a seam.
however other seams on the prints are fine.
screenshot of slicer with seam, also screenshot of layers settings.

I have it set to aligned, fill gaps, arachne

c058b47c-prusa_mini_print_settings_layers_perimeters_screenshot-2024-02-03-133213.png

586318ea-prusamini_sliced_seam_screenshot-2024-02-03-132923.png

RE: Print quality - PETG with IS

mark — Sat, 03 Feb 2024 21:21:11 +0000

Posted by: @brian-12
I was going to suggest looking at the tool paths in the slicer to see if that tells you anything.
I have had to up the temp with PETG 10 degrees with IS, but your problem seemed only on 1 area and not random throughout the print.

Yes, you can turn on visibility of seams, retractions, etc. in the slicer and see if the anomalies line up with anything.

Regards,

Mark

RE: Print quality - PETG with IS

Brian — Sat, 03 Feb 2024 21:16:04 +0000

I was going to suggest looking at the tool paths in the slicer to see if that tells you anything.

I have had to up the temp with PETG 10 degrees with IS, but your problem seemed only on 1 area and not random throughout the print.

RE: Print quality - PETG with IS

mark — Sat, 03 Feb 2024 20:54:08 +0000

Posted by: @toddg
No crashes, everything printed and completed.
Only issue is those two side walls, the rest of the boxes/prints look great.

Does the problems follow the seams? Try different seam settings. There are issues with seams in IS.

What is this setting currently?

Print Settings | Layers and Perimeters | Advanced | Seam Position

Regards,

Mark

RE: Print quality - PETG with IS

ToddG — Sat, 03 Feb 2024 20:45:25 +0000

No crashes, everything printed and completed.

Only issue is those two side walls, the rest of the boxes/prints look great.