Pivots

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Pivots
These parts are designed to be used in conjunction with my extrusion profile.
http://www.thingiverse.com/thing:213749
They can be used to create all kinds of hinge joints. The nubs can be mounted on the extrusion using off-the-shelf M4 screws. The shaft diameter is 5mm.
To build hinge joints that are operated by an actuator (servo) see my set of actuator adapters and arms.
http://www.thingiverse.com/thing:213762
http://www.thingiverse.com/thing:213764
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 --

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