3DPrinting
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My best guess would be that you have some petg left in the nozzle that for whatever reason isn't being melted and pushed out, what you could try is doing a cold pull
If you haven't done it before, you basically heat up the hotend, feed in some plastic, then you turn off the heat and let it cool down until the plastic is partially hardened, then you yank on the filament
If everything goes right, the plastic down in the nozzle will be yanked out, and pull with it any impurities, leaving the nozzle clean and unclogged
Alternatively buy a new nozzle that you only use for PLA, i have heard a lot of people having issues like this when switching back and forth with the same nozzle
Yes, I have tried that but it didn't help then I tried to burn away everything in a nozzle with a flame so the nozzle was very clean and I think it helped a little but after a few minutes of printing PLA, I still heard grinding of filament.
just came to my mind that I can try to check ptfe tube that goes to hotend I know those are a bit sensitive to heat even tho in Prusa Mini the tube shouldn't be in a melting zone but mine is very old. It is the one that my printer comes with so maybe I should replace it. I will update you guys if that is the case.
The Ptfe tube is likely the answer, if you can replace I recommend trying to. Make sure it is seated correctly and properly clamped in place when you’re putting it back together.
Good luck!