I decided I needed a new shift knob, here it is. I printed it at high infill. It's ended up being way to big. I went to resize it, but the pips used the edges for reference and they moved all over the place. I decided to enlarge the mounting hole and then reduced the size in print. It worked out well I think. I was worried about it holding up to the heat in the summer in SoCal. But so far, no problems.

12/24/2016 Update: 2 1/2 years later and still no problems. It's discolored a bit and the acetone vapor smoothing shell has crazed as seen in the lastest picture, it actually looks antiqued now which fits well in my '61 pickup truck.

Print at 50% infill or higher for strength and print at 75% of the original size and it should all be good. I used a drop of black nail polish in each indentation to accent the pips as well.