Knob should fit on any EC11 encoder with a splined shaft. STEP files of the plain knob is available if you need to modify it to fit your encoder. I printed mine in TPU because that was the only matching color I had on hand, but should work well with any material.
Printing instructions:
Orient all models face-down on build plate, no supports needed. 100% infill. Print at 0.1 resolution for best result on the knurling.
The author marked this model as their own original creation.