Logitech sequential shifter knob
thingiverse
I modeled this shifter knob after the same shape used by the ProSim sequential shifter knob. My thought process being that a high-end piece of hardware like that most likely comes with decent ergonomic. I would also recommend printing this one to a thick density and sand it to a very smooth finish. One of the two versions of the knob has an additional cavity at the bottom, so that it is also compatible to this mod, https://www.thingiverse.com/thing:4745214/files
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