Notifications
Clear all

[Closed] bad layer adhesion after filament change  

  RSS
TeeB
 TeeB
(@teeb)
Active Member
bad layer adhesion after filament change

Printing primarily PETG with HIPS interface support layers. After a filament change there is no noticible visual difference while printing but the model will break very easily at those layers. The bond between the other PETG layers further up or down are solid and fused together while I can sperate the bad layers with my fingernail.
What I have done so far, I made the prime tower a lot bigger to avoid mixing the two materials and raised the temperatures.
Whal else can I do?
Please also have a look at the gcode

Posted : 08/02/2018 8:49 pm
TeeB
 TeeB
(@teeb)
Active Member
Topic starter answered:
Re: bad layer adhesion after filament change

I did some further research. I printed the same object with the same settings but this time I used the HIPS filament for the support only. The result was a still good looking model but now I can separate every single layer with my hands easily. Instead before only a few layers above the change would be loose.
Next thing I tried was cutting down the time for each filament change thinking maybe the PETG cooles down to much, so I decreased the size of the prime tower. Still no luck.
Is no one having this problem ?

Posted : 09/02/2018 2:09 pm
Johncoffee
(@johncoffee)
Trusted Member
Re: bad layer adhesion after filament change

Maybe a stupid question- but what is PETG with HIPS interface support?
Maybe a picture showing your problem would help.

Posted : 11/02/2018 12:14 am
TeeB
 TeeB
(@teeb)
Active Member
Topic starter answered:
Re: bad layer adhesion after filament change

Oh, my bad. I mean I wanted to print a model out of PETG and only the dense support layers, which are the layers directly touching the model, those are out of HIPS. This way I could solve the HIPS material in D-Lemonen and don´t have to manualy clean up the entire piece.

Posted : 11/02/2018 5:32 pm
Cubik
(@cubik)
New Member
Re: bad layer adhesion after filament change

I have totally the same problem.

Also tried various parameters to change with no luck.

Printing in closed chamber 40°C ambient but the printed model is brittle in layers with material change.

Did you find any solution so far?

Posted : 17/12/2018 2:43 pm
cwbullet
(@cwbullet)
Member
Re: bad layer adhesion after filament change

I bought a different bed for several filament types and I keep them for just on filament type. I fount that it prevents poor adhesion after TPU.

--------------------
Chuck H
3D Printer Review Blog

Posted : 18/12/2018 2:50 am
Cubik
(@cubik)
New Member
Re: bad layer adhesion after filament change


I bought a different bed for several filament types and I keep them for just on filament type. I fount that it prevents poor adhesion after TPU.

Well - that is not the case right?!
The bed adhesion is just fine - i would say awesome. But adhesion between layers where the filament change from one to another is just bad.

Posted : 18/12/2018 8:24 am
Share: