From my testing, Taulman Nylon likes hotter temperatures for proper layer fusion. When I printed my first batches of 618, I could not rip the layers apart. They were bound so strongly, that the rip actually occurred diagonally across layers.
What temperature did you use? I’m printing at 243c in this example.
I went up to 248 (very slowly and carefully) even with my stock hotend before it really worked well. But your thermistor may be off too so be very careful if you have peek and ptfe in your hotend. I switched to e3d and now I go with 250. A few degrees does seem to make a big difference in strength.
248 here as well. At the time I was on a jhead though and didn’t want my peek insulator to melt. I would readily go up to 250c as a starting point now.
Thanks for the tip - I just received an all metal hot end from PB, which will happily run at 300c+ so I’ll install that before upping temps any higher.