Great way to get your drive to work! I wish we had a 3D printer like you, actually I wish I had all the resources you have.
There is one concern I have with 3D printing parts, that a company manufactures and sells. Since this company probably has patents on their belts/pulleys you may be getting into some legal issues with Gates.
I have two solutions:
1. Gates sponsors FIRST, you can call them up or visit their website, and get parts for free (I believe). This is what we did last year for our prototype chassis, however they may not be free for every team as we are sponsored directly by Gates.
2. You could call them or send an email to them explaining the situation you are in and get permission from them to 3D print their parts.
I may be completely wrong, and their may not be an issue with this at all, but it's just a thing that came to mind when I saw this.
Good Luck this year 4334! You have a lot of people looking at ya this year
EH TEAM!!!