This part I designed and made for my inMoov Robot. The robot is designed by Geal Langevin. Take a look at his website (http://www.inmoov.fr) and build your own.
This part has a 35 mm hole for in my case an Innox speaker stand. This way I have a strong base because my first setup fell down and my inMoov was broken badly. You can follow my build on http://www.swanrobotics.com
I used PLA for this part. Original Ultimaker Silver metallic.