Files are now located here for download
https://www.printables.com/model/158273-toyota-tacoma-manual-shift-knob

My Toyota Tacoma shifter got scratched up and the leather peeled away. It looked ugly, but most importantly the 6-speed tree illustration was no longer visible for people who occasionally drive my truck and can't find reverse. I bought a replacement "ball" knob, and hated the way it felt. It was uncomfortable and only after a few months, the tree illustration faded away. I also really missed the contours of the original shift knob as it fit my hand well and was comfortable for long drives. I couldn't find an affordable replacement option so I had to get creative. I grabbed the tattered remains of the original knob and carefully scanned it with my Kinect Xbox360 scanner, then tweaked the mesh in Meshmixer. Then I imported it into Fusion360 fiddled around with it some and here we are. Enjoy!

I had an ordinary M12 x 1.25 hex nut that fit the shift stick, and made a version to accept one if you prefer having a metal-on-metal connection. Just run your slicer, and pause at the last layer height for the nut cavity. Drop a standard M12 x 1.25 hex nut inside, and resume the print. You may need to trim any plastic lip with a small blade to get it to fit properly, but it should have allowable tolerances.

I've uploaded a few versions.
6 Speed Knob
6 Speed Knob + Nut cavity
Smooth Knob
Smooth Knob + Nut cavity

Update!

Looks like there are other gear trees out there for the Tacoma and perhaps other vehicles. I added a few more:
4 Speed knob
4 Speed knob + Nut cavity
5 Speed knob
5 Speed knob + Nut cavity
7 Speed knob
7 Speed knob + Nut cavity

Update
Posted requested 6-Speed CAD file.
Also, using a slightly different geometry. Better smoothing and slightly wider profile for a better ergonomic feel.

Feel free to tweak and customize. I added CAD files. I'd love to see your pics or remixes!