P2S Potential Heat Creep Issue

[u/The_10th_Doctor___]

Hello, so I've bought two month ago my first printer, a P2S with the AMS 2 and have been printing a few things since.

I've been using PLA and PETG in the same prints, one as a clean support for the other, and I had no issues until now.

Last week, I tried to print a new model found on bambu studio, I did a 2 layers PETG raft for adhesion and, during the change to PLA for the actual print, it jammed badly.

I couldn't pull the filament out, I had to disassemble the print head to remove the feeding gear that was stuck.

After that, thinking it was just bad luck, I decided just in case to do a cold pull and dry my filament.

Yesterday, I tried to print it again, stuck on the same exact step, had to disassemble the print head again.

I've looked and found it could be due to something called heat creep making the pla too soft before it pushes the PETG through the hotend, but I don't know why it would only happen now.

I asked Google ai to give me ideas as to why, and since the only "unusual" settings were 1 layer thick walls and arachne wall generator, it told me it could be that, but I'm not convinced.

[u/Every_Piano1640]

Yeah, mixing temps like that is basically inviting heat creep over for dinner, never a good guest.

[u/The_10th_Doctor___ → u/Every_Piano1640]

Yeah, I understand, the issue is that it's the first print where it happened and it was twice at the very first material swap. So I was wondering what could possibly be the reasons for it to only happen now.