sankayop

Thanks @SandervG, In the meanwhile, I have put a new BB 0.8 head to reduce the clogging effect. The result is on-going but looks ok. Of course, at the cost of the resolution (that is now limited to 0.2mm). I'll let know if this helped or not. Concerning the BB 0.4, I don't think our natural PLA is wet because I don't see any groves from the feeder at its outlet, neither any issue with the feeder (except the bowder loosening). Nevertheless, I just read about the cardbox procedure (with 50'C on the building plate) for 2-4hrs ; or the 8-10hrs in an industrial oven. (I don't see why such a difference). We have both so, I'll give it a try. Concerning the bowder coupler, I have never seen these 4 small metal blades, so I suppose I should look after them (re-order). Default profile is what we are using currently. Cleaned core: I have cleaned it with PLA filament 4 times, and Cleaning filament 4 times. So, Thanks for all your guidances, I do have some threads I can try before reverting to you. Step by step, I will first continue with the BB 0.8, default profile, and do my part. Then, go back to BB 0.4, clean the head once more, dry the PVA and give it a try. If it does not work, redo the process after having ordered the metal blades. Thanks,

Hi @LePaul, Your post is very interesting. We just bought the S5 pro bundle and encountered the exact same problem with PVA in extruder 2 BB 0.4, temp. 215'C, (i did not tried extruder 1 because it is working perfectly with tough pla and I prefer to keep at least this head working...) We are using Ultimaker natural PVA kept in the provision store. Have you found a solution for this issue? In my case, I thought I found a solution by increasing the extruding speed from 35mm/s to 70mm/s and it worked, the first times. But after a few prints it got back to a clogged head (i.e. 0mm/s). Obviously, the filament's feeder continued to push the filament in such a way that the last bowder between the feeder and the head got disconnected reducing the push inside the head even further. After cleaning the head with cleaning filament, we indeed observed a kind of caramelized clogged material. Thanks for your feedback (and solution if you have one 🙂 ), Yoshi