I got this file directly from Printrbot. This is a printed part included with the Play that broke on me. I had to wait a couple weeks to get a replacement sent out and they sent me that file so that after I got back up and running I could print myself a spare copy.
I'm uploading it here for my future use and because I hadn't seen it when I searched previously.
This is not my design.
Print oriented as listed. You'll need supports as well.