I think this is awesome.

General CNC CNC Routers
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I think this is awesome. I have a need to dispense glue through a cnc print head as well. I wonder what he used there to dispense clay.

Originally shared by Make:

Oliver van Herpt is printing out clay artwork that would have been impossible without his really cool 3d printer. http://ow.ly/B3RhB

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For thick glues you may use this: http://www.nordson.com/en-us/divisions/efd/products/valve-systems/dispense-valves/Pages/auger-valve.aspx