Perhaps not exciting to experienced users, but my first time so exciting for me! The bottom “tab” on the holder for my servo motor broke when shoved/stored improperly in the box, and so I found the CAD models and 3D printed a replacement (and an extra as backup). And it all works great!
Printing replacement parts is the first step towards generating custom parts! 
Because I had trouble finding it, re-posting the link to the Printables page with all the XRP Robot CAD Models for downloading-and-printing:
https://www.printables.com/model/576581-xrp-robot-part-of-the-openstem-project/files
Thanks everyone!
- Dr. E (Ethan Danahy from Tufts University)