Yazzo Motor Arm

Although you can make an arm of any length to mount to a motor shaft using these two things:
http://www.thingiverse.com/thing:6452
http://www.thingiverse.com/thing:6354

and some suitable rod/tube stock, sometimes I just want a quick and easy arm of a given length that is totally printable.

This thing is kind of a mash up of the other two things. On the one end, you can mount it to your 5mm motor shaft (the shoulder). On the other, it has a ball bearing to form a 1DOF joint (the elbow).