I am working with a new TAZ 5. I have a lot of experience working with them in the past, but this particular one is totally fresh. I am printing with PLA and have tried temps ranging from 190-210.
My prints work fine for the most part. However, after every time I’ve printed and let the head cool down, the next time I try to print I get no extrusion except a few little spots. I cold pull the material, re-heat the nozzle, re-insert material, and then it works fine until I let it cool down again. It seems that the PLA is melted and reformed all the way up to the bolt and toothed gear that pushes against it. It seems like it may be melting too far up the filament and then getting stuck once it cools. However I can’t tell if this is really the problem, as I don’t know if it normally does this.
How do I deal with this? I never had this problem on previous machines. I have searched these forums and google for information on heads not extruding, but they all seem to only cover cleaning or cold pulling the head. I have no trouble getting it to work again, but I don’t want to have to cold pull it every single print.