All of our 3D printed parts can be found on thingiverse in our 2014 collection:
https://www.thingiverse.com/team2177/collections/2014
We have 4 distinct parts for this year:
Battery plugs
These have "Charged" and "Not Charged" on them, allowing you to have plugs in every battery while still indicating the state of the battery. Bonus points: Print the "Charged" in one color and the "Not Charged" in another!
Pneumatic storage tank holder
Designed to hold 4 tanks in a square pattern, can also be adapted to hold 2 stacked.
Ball Roller
We designed a roller for a 1/2" hex shaft. It has a curved surface to match the ball, and is 12" long (printed in 3 segments). Please note - you'll want to put something on it, like spray rubber, to aid in traction with the ball!
Winch spool
We're using a winch to pull our catapult down, utilizing 1" webbing. The spool prints in two parts, is designed for a 1/2" hex shaft, and has recessed 1/4" holes to secure everything together. It also comes with a guide that fits over the spool (with clearance holes for the 1/2" hex shaft) and helps ensure the webbing gets placed on the spool to avoid tangles. Obviously, it has a lot of compression force on the winch when it works, so we recommend using 100% infill!