I also saw the NuNus filament, but the rating on amazon seems to be a bit inconsistent…
Thats why i got the Velleman filament. It is cheap and i think they have it tested with the k8400
So for the start i won’t make the road more bumpy than it has to be and with eliminating the question of “is this problem caused by mechanic or by filament” i can focus on solving problems more effective
I use 3Dprima’s. I am very happy with it. Never had any problems with their PLA or ABS. Recently started toying with other types and so far im happy with their filament.