Teds455

I wound up changing the nozzle and it corrected the problem. I could not simply wipe off the excess material from the old nozzle... Plus when i removed it and manually cleaned it, I could not load filament after re-installing... It would not extrude the TPU through, even after multiple tries. Installed the new nozzle and I'm back in action.

Hello! First post, glad to be here... I've been printing a fairly complex design with TPU on my Ultimaker 2+. The design takes about 24 hours to print, as there is a TON of support material required. While the first 3 have printed without a hitch, now the material already layed down appears to get stuck to the nozzle with each pass at times, ruining any possiblity of the print being finished. Luckily I've descovered this early on during the print job. I've already checked the bed height, and do this frequently, and performed a calibration as neccessary. It appears the nozzle is loaded with the TPU material and perhaps this is what the print gets stuck on during the pass. I'm still using the original nozzle that probably has a couple hundred hours of printing various materials. While I haved been greasing and oiling the moving parts, I have done nothing with the orignal nozzle already installed when purchased. There is another nozzle that came with the printer, but I'm not sure if it is the same and if it's suitable to use with TPU. Is there a way to clean the existing nozzle? Any help would be appriciated, as I have about another 4 days of printing to do with this design. Thanks in advance! Ted