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Extrusion
This is out extrusion profile. It is 20mm x 20mm cross section. The slots and the hole are designed to work with M4 screws.
Some interesting features --
The cross section of the slot is square. It can be used directly with standard M4 screws eliminating the need for specialty nuts. (ref OpenBeam)
Also the edge of the slot is chamfered to serve as a guide for wheels and balls which can be used to make a sliding mechanism. (ref V-Slot)
We have three push fit connection systems which can be used to connect extrusions in different configurations, no screws needed.
http://www.thingiverse.com/thing:213821
http://www.thingiverse.com/thing:213819
http://www.thingiverse.com/thing:213819
Alternately we also have a set of joining plates and angles for stronger connections.
http://www.thingiverse.com/thing:213776
http://www.thingiverse.com/thing:213750
We also provide parts to make a hinge or pivot joint.
http://www.thingiverse.com/thing:213770
To make pivot joints that are powered (by a servo for example), please see our motor arms.
http://www.thingiverse.com/thing:213764
To mount motors to our extrusion see our actuator adapters.
http://www.thingiverse.com/thing:213762
To build a sliding mechanism see our slides.
http://www.thingiverse.com/thing:213861
NOTES:
We are planning to get many of these parts molded so "makers" can buy em cheap and use for their projects. We need your feedback --

1. What other parts would you like added to the library?
2. What colors should different parts be molded in?
3. What would you build with it?
4. Would you like any parts modified?
   We welcome other comments and suggestions