Warping with PETG (Mango Yellow)  

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astambaum
(@astambaum)
New Member

Hi,

I am trying to print PETG sample for my bechalor thesis. After some adjustments on the prusa MKE3S+ I have succesfully printed my samples with filaments as ASA, ABS, Colorfabb HT and PETG Carbon. Now I am trying to print a PETG sample, but I am struggling with warping. I have tried a lot with the setting from cold to very hot bed temperatur, cleaning the powder coated spring sheet, using a enclosure, different nozzle temperatur and different first layer height (0.2 mm and 0.3 mm). 

My samples are 50 x 50 mm width and 10 mm height solid cuboids.

And my actual settings are:

Nozzle temp.: 230 Celsius

Bed temp.: 90 Celsius

Brim width: 10 mm

Draft shield: on (1 loop, 2 mm distance)

First layer hight and speed: 0.2 mm and 10 mm/s

Infill: 100%

with enclosure temp.: approximatly 30 Celsius.

 

As you seen in the picture, there is warping at the edges of the solid cuboid.

Do you have any suggestion what I could improve or change? 

 

Thank you for any suggestions!

 

Posted : 29/03/2021 4:06 pm
Diem
 Diem
(@diem)
Honorable Member

100% fill is usually a mistake in any but smaller objects.  Unless you are for some reason collecting samples of why-not-to-do-it results you wold be  better to use three or four perimeters and 10% - 15% fill.

Cheerio,

Posted : 29/03/2021 5:46 pm
fuchsr
(@fuchsr)
Honorable Member

What @diem said, but this may not be enough . Warping is very common for large rectangular objects. I wouldn’t call 50x 50 large but who knows. Couple of things you can try:

— add mouse ears to the corners. Small, one layer high disks. You can do that in PrusaSlicer. 
— add a brim around the whole model

— I’ve used Layerneer bed weld successfully to fight warping. 

Posted : 29/03/2021 6:50 pm
Dan Rogers
(@dan-rogers)
Honorable Member

For your thesis you should include a section about how hard it is to print long solid cubes on a FFM printer.  Hopefully you have a whole section about different printing challenges that require science (seeking to understand) to solve.

I hope your thesis isn't "I printed 10 different cubes in 10 different materials" - and didn't learn anything!

Posted : 31/03/2021 2:56 pm
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