Solid Thangs gear shifter knob. This is one of many shifter knobs I design for fun. This particular one is a blank, meaning you drill it yourself and add in the nut that you want.

Or request a size and I'll upload one ready to print and add to a vehicle.

I print 0.12 resolution and 100% infill. It takes a good 7 hours, but it's worth it.

At only 76 grams you can make 14 of these with one roll of filament. A custom shifter knob for less than two bucks!