Layer bonding PETG not very good?
Hi there,
a tip from patrik following i bought a role PETG Red, 1.75mm from Prima Select and printed now maybe 3-4 objects.
I use 235° for the nozzle and the PET(G)-preset in Slic3r.
My problem is, that i think, that the bonding between the layers is less strong as on ABS/PET.
I printed a the catapult from thingiverse - the catapult-arm is broken, as i try to put it down. Okay. Can happen, ABS was suggested.
Today, i printed a little funnel-adapter (10mm to 7mm), and was wondering, that the above 2 layers break from the object, as it tried to mount my bigger funnel.
So i think, that the layerbonding is not the best. The cause could be the filament itself (hmpf) or some printsettings.
I read a bit, most threads regards ABS, but they say, you should raise the Nozzletemp. With 235°, i'm in the upper segmet for PETG-Printtemps - i will try to raise the temp to 240°, but i doesnt think, that this would change anything.
Is it possible, that to high printtemps lower the layerbonding?!
During print, the Nozzlefan runs - could this be a reason? I will try...
Any other ideas, that i could check? Thank you 🙂
Re: Layer bonding PETG not very good?
Try without the fan except for bridges probably, for me PETG sticks to everything like glue.
Re: Layer bonding PETG not very good?
Especially the heated bed! 🙂
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: Layer bonding PETG not very good?
Hey,
i tuned the Slic3r-Settings for my PETG-preset: So that the print- and fanspeed is reduced only at extrem short runs (< 3 sec).
Additionally, i printed at 230° (not 235° as described) - so i raised the temps to 235 and the Heatbed to 65°/60°.
Now the prints seems to be okay. If i deactivate the fan, i have problems by short printheadruns (like 5mm diameter-circles), because the filament on the printbed is melting...
Also, i raised the nozzle a bit higher from bed.
BTW: Printed ABS a Week ago. 11h Print. Today i had to remove the skirt... NO WAY. It breaks after some mm of removing.. so i had to turn on the bed to 100° 😀 Sometimes, this stuff won't adhese on the bed.. and sometimes..
Re: Layer bonding PETG not very good?
Can you try to use an infill that has a structure to disperse the the stress in the X,Y,Z planes (cubic rect.) or can you print the object in a different orientation?
Also, can you put the object in a zip lock bag and anneal it using hot water? How about increase the infill?
What about increase the scale to add more material to the object?
What slicer did you use and which profile?
Maybe you could use the color print option as follows:
1) Start printing with PLA
2) Half way through printing the arm, use the change colors option.
3) Instead of changing colors, load up PETG
4) Manually adjust the nozzle to the higher temp needed for PETG
5) Decrease the print speed to 35%
6) restart print.
Re: Layer bonding PETG not very good?
I like the idea of annealing in hot water in a Zip lock bag. I wonder if anyone has tried that?
Re: Layer bonding PETG not very good?
fans off, slow down layers under 15 seconds in length.
look at my taulman nylon settings,
http://shop.prusa3d.com/forum/print-tips-slic3r-settings-kisslicer-model-repair--f12/slic3r-settings-for-taulman-bridge-nylon-t4358.html
that will give you a baseline, you will need to address Bridging and how you want to handle it but the basics will cover nylon and ABS as well.
“One does not simply use a picture as signature on Prusa forumsâ€
Re: Layer bonding PETG not very good?
I was having problems with layer adhesion when printing with PETG. I slowed the print speed to 40%. This solved my problem.
Re: Layer bonding PETG not very good?
I read a bit, most threads regards ABS, but they say, you should raise the Nozzletemp. With 235°, i'm in the upper segmet for PETG-Printtemps - i will try to raise the temp to 240°, but i doesnt think, that this would change anything.
I print eSUN PETg at 240/70. 40mm/s, first layer 50%.
It gets very strong layers.
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Gert