Custom Shift Knob

Just a funky shift knob I designed for my VW Bug. I left the inside shaft smooth on the final version because I found it easier to use a tap to create the right thread in the finished product than trying to get the printer to properly print the threads.

Definitely want to print 100% infill or it WILL fail with use/heat. I put it on my drill press and used sandpaper to get the smooth finish.

Edit: I've added a version with a 8x1.25 tap