PETG HF model with PLA supports has PETG stringiness at support interface

[twh]

tldr; I have dried the filaments. This PLA and PETG HF prints out fine on its own. This uses 2 print heads, so no filament change step. I’m using Bambu’s recommended settings already, including z=0. I’ve done the obvious things; no joy. Looking for ideas on what to try next. Thanks!

• Detailed description of the problem:

• 1. on the underside of the PETG HF model, print quality is quite poor; “stringy”.

• 2. The top (no supports) looks fine, although it does show some strange holes.

• Printer model used: HD2; PETG HF on left head, PLA Mat on right head

• Slicer settings used

Bambu recommended support settings. Printing guide for using PLA Basic and PETG HF/PETG Baisc for support | Bambu Lab Wiki

• Type of filament used

model: PETG HF (dried in Bambu AMS HT)

supports: PLA Matte (dried in Bambu AMS HT)

[Croisade]

I had the same sorts of problems with the default PETG HF profile in bambu ?…i switch to standard profile and it’s print right .

And your not obliged to set the raft base in Pla. only the contact surface. you will save a lot of times and nozzle exchanges. :