Prusa I3 MK3 Selection Knob/Button

I didn't like the original knob because it had this little pointer that is usually applied when there is a maximum and minimum travel length.
This confused me a lot and wasn't very ergonomic, so I designed a more ergonomic one that also made more sense for me. Since mine doesn't have a pointer, it kind of implies that you can turn the knob indefinitely.
Also I created a little dome to make clicking it more pleasant to the touch (the original version had one, but it wasn't as good in my opinion).