gear type displacement pump?

Is there anyone out there using a gear type displacement pump to do paste extrusion? It seems like that would be the simplest type of cold extruder to accurately control with a stepper. It should be pretty easy to fabricate and cheap, too.

What I have in mind is similar to this: [www.grainger.com] but much smaller.

... I did with micro-gearpumps and high viscous fluids - but a peristaltic pump ( [en.wikipedia.org] ) is simpler and easier to print and when clogged by settling sediments, you have only to replace the tube.

Another interesting simple type without bearings is a vertical oriented tube and three (or more for higher accuracy) solenoid-actors, that will compress the inner volume in sequence ...

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Viktor
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Thanks! That looks like the data that I was trying to find.