Are you stuck idling when you'd rather be driving? This pocket-sized six-speed gear box fidget may help. Feel free to make vroom-vroom noises as you lace through the gears. The gear graphic on the back identifies you as a proper gearhead.

This prints in place, and hence, is designed specifically for a 0.2mm layer height. You should also set the printing line widths to 0.4mm. The shift knob prints-in-place over the bottom surface (with a 0.2mm gap in between), so you need to set your perimeter printing speed low (~20m/s) so that it the first layer of the knob prints as a circle. 

After printing, gently use a small screwdriver to pry the bottom of the knob loose – don't try wrenching on the top of the knob because it might snap off first. To make it shift smoothly, put a tiny dab of oil, light grease or vaseline in the shift track and work it all around with the shift knob. It should glide quite smoothly.