Can report back that the all metal hotends have made a huge difference and I don’t get any clogs or under extrusion. The erosion was under extrusion but the hot end is a lot better for consistency and quality. I now run Orca and used their flow calibration tests which are excellent ( highly recommended if your here researching TPU and the J1S)… the standard flow was way way off for TPU and was no doubt contributing to part of the problem.
1 Like