Modular Mounting System - 17 mm ball joint

This is a 17mm ball joint for the Modular Mounting System by yyh1002:
https://www.thingiverse.com/thing:2194278

I had few phone holders with 17mm ball joint laying around and decided to use it as desk phone stand. Because I've already have few Modular Mounting System parts printed and didn't found join part optimized for 3d print I created one. 

Ball in model is cut on te bottom to make it possible to print without support so I didn't had to sand it.

After print I realized that arm between gopro connector and ball might be shorter. Let me know if you need shorter/longer version and I can modify it for you.