Extruder wheel, This will fit any nema 17 stepper . simple yet sophisticated

check out my other extruder wheels
https://www.thingiverse.com/thing:4109855
https://www.thingiverse.com/thing:3759213
https://www.thingiverse.com/thing:4075364
https://www.thingiverse.com/thing:3757531
https://www.thingiverse.com/thing:3766169
https://www.thingiverse.com/thing:3761674
https://www.thingiverse.com/thing:3759479
https://www.thingiverse.com/thing:3708046
https://www.thingiverse.com/thing:3648860

If you download any of my designs please consider clicking that "like" button.