I have some of these Martin portable stove for camping. One knob failed and it is not possible to find spare part.
I used the work from BombJack98 with PrucaSlicer to slightly modify the design.
It is not the most elegant because i'm limited with what the slicer can do with editing a stl file.
I simply cut some parts and move them where it needed to go.
I used the following configurations:
15% infill
8 Top layers
4 walls
Support required *Better finished product when printed the knob upside
The author remixed this model.