A great modification for the Z axis wheel that is much pleasant for your thumb and offers better access and control.
UPDATE 2024-10-01:
It seems like newer revisions of the STECS throttle have remade the whole assembly for this part to the point that this knob doesn't fit anymore. I would gladly receive detailed measurements in DM so I can design another version of this for newer STECS revisions.
The author marked this model as their own original creation.