I’m playing with using pla as a support interface on petg.
It appears to be printing ok, until it gets to the point (layer) where the pla is printed. It doesn’t appear that the petg was printed on the same layer, causing the part to fail on that layer. It looks as though there’s a layer missing.
The pla prints great, and actually sticks a bit to the petg.
Bambu P1S with AMS
Using Orca slicer
Support settings:
Normal supports (auto), grid, on build plate only
Support/raft base… Default
Support/raft interface…pla
Top z distance… 0
Bottom z distance…2
Top interface layer… tried 4 then 1. No change
support/object xy distance .2mm
Using Creality PETG and Sunlu PLA
Thanks for any help.
BambuStudio calculates flushing volume using color brightness instead of material. This mostly to prevent color bleed after filament swapping.
Inside my AMS there is 3 rolls of PETG and 1 roll of PLA (5th roll is on the side of printer). Yes, I use PLA as support interface for PETG as well.
From 1 to 4: flushing is 500 mm3, which is to get rid of black completely
But from 4 to 1: flushing is only 160 mm3, which is saying, color bleed of brighter color into darker color is more or less acceptable than the reverse.
Which means after it used PLA as support interface, there was still a bit much of PLA left inside of the nozzle probably mixed with PETG on that same layer or next layer of the main part.
If your PLA and PETG were almost the same color, the flush volume would be like Zero or very small.
Solution is to increase the flush volume manually when you change filament from support interface.
