Mk7 GTI Shift Knob

I recently purchased a used Mk7 GTI with a very well-worn shift knob. I looked around to find a suitable replacement for it which could closely represent the original look and feel. However, I couldn't find anything that seemed reasonably priced to me (AKA I didn't have $200 to put into a shift knob) so I decided to try and replicate the original. 

This proved to be a rather difficult task and was a lot more work than I was thinking it would be, but I carried on. This design (at the time of publishing) is in its sixth iteration which at the moment is the most I've ever iterated on any of my designs.

I tried my best to represent the original design including the dimples around the ball itself, but I will also be publishing a version of the knob without the dimples for those who prefer it.

Procedure:

1. First, obviously, you will need to get in your car, but before that you're going to want to get a small prying tool in order to take the coin out of the shift knob, it will need to be quite skinny because there is very little clearance around the coin in order to hold it tightly. You will also need a T27 torx screwdriver to take the ball itself off.
2. After you have your tools, as said in the previous step, you will need to take the coin off. Just to clarify, the coin is the part that shows you where all of the gears are positioned on the top side of the shifter. Once you've successfully pried the coin out of its spot, you should see a small rubbery round thing with a cutout for the screws inside of it, you will need to pull this rubbery piece out of the original shifter as well. This will be used to secure and locate the coin in the new knob.
3. Now that you've cleared out the coin and "rubbery thingy" (technical term) you will need to use your T27 torx screwdriver to take out the screws holding the shift knob in place. We will be using the same screws in the new knob so best to keep those somewhere safe in the meantime.
4. Hopefully at this point you've already printed the new knob so you should be able to put that on now, if all is right it should only fit one way so there shouldn't be much trouble with that. (I would recommend sanding the knob before putting it on but that I'll leave to personal opinion.)
5. Now you will want to attach the shift knob to the main assembly using the screws you got from the old one, be careful not to over tighten these or it could create a crack in the new knob by separating the layers, I had this happen to me while still in the prototype phase and the knob only lasted around 20 minutes of city driving. While my prototype was hollow and just meant to test the fit of the design, the point still stands. In my humble opinion, it would be best if the knob stayed in one piece while driving.
6. With the screws tightened to the point that there is even and solid contact in all contacting faces you can now put the coin back in place, you will want to make sure the "rubbery thingy" is already on the coin before putting it in. You will then want to make sure that the coin is oriented correctly as you push it into place as it will be difficult to fix once the coin is fully in place.
7. Everything should be good at this point, and you should be good to use your new knob to your hearts content ramming it around left and right. However, nobody likes a broken knob, and it would be best to protect your knob and not be too rough with it. 

The knob can be printed at different infill levels to change weight to your own preference however I wouldn't recommend printing it below 30% infill in order to maintain structural integrity, I myself would rather not break my knob while trying to look cool.

I also recommend printing the knob with the coin face down. That's how I've printed it so far in order to print the features accurately. You should be able to just flip the design 180 degrees to correct this.