PETG with PLA support default bed temperature  

RE: PETG with PLA support default bed temperature

I just started a new print and it's using 80 degrees for the initial layer and then reduces to 60 degrees on 2nd and above layers. This must surely be a bug?

RE: PETG with PLA support default bed temperature

It's difficult to guess why this is happening without seeing the Project file. please save your project as a .3mf file, then zip compress the zipfile and attach the compressed zipfile to your next post.
do you have any PLA on the first layer? I Use PLA for the support interface layers  and PETG for the rest of the supports are PETG, generally this means there are no PLA Areas on the build plate
Have you set the bed temperatures for both filaments to have 80C on the bed at all times? (this is generally OK if you don't have PLA on the build plate! ) 
If the PLA is set differently to the PETG this may be the root cause of your issue

regards Joan

RE: PETG with PLA support default bed temperature

Posted by: @joantabb

It's difficult to guess why this is happening without seeing the Project file. please save your project as a .3mf file, then zip compress the zipfile and attach the compressed zipfile to your next post.
do you have any PLA on the first layer? I Use PLA for the support interface layers  and PETG for the rest of the supports are PETG, generally this means there are no PLA Areas on the build plate
Have you set the bed temperatures for both filaments to have 80C on the bed at all times? (this is generally OK if you don't have PLA on the build plate! ) 
If the PLA is set differently to the PETG this may be the root cause of your issue

regards Joan

The bed temperature for the PLA (support) is set to the default 60 degrees. Since the part is printed in PETG I would have thought it remained at the part bed temperature? The project file is attached, but if it is as you say that you actually need to set both filament bed temperature to the one you want throughout the print, then that's obviously the explanation.

I haven't had any luck at all just using PLA (or PETG for that matter) as only the interface layer, since I cannot get the interface layer to stick to the support structure so I tend to print the whole support structure in the 'other' material.

RE: PETG with PLA support default bed temperature

Looking at your .3mf, 
first point, the original STL has errors. it would be a good idea to fix these first 
your original setup has both PETG and PLA on the first layer, You could consider adding a RAFT in PLA to isolate the PETG from the first layer. 
if you set the interface pattern spacing to '0' you get a solid interface,  this should give more support and less distortion of the interface area.
if you change the wipe tower extruder to extruder 5,  the wipe tower 
should remain attached to  the Build plate  at the lower temperature. 

unfortunately I don't have an XL to test these settings, 

regards Joan