Metering Extrusion Rate... optical mouse?

hey all!

Here's a project I've been working on. It's a CNC wire cutter that attaches to a pug mill ceramic mixer/extruder.

https://youtu.be/nMWkgnt1LOY https://youtu.be/y3Iks36yfXk

http://imgur.com/a/spOTG

The Pug Mill extrusion rate is not as consistent as I hoped, and I need to find a way to meter the rate of extrusion so I can adjust the wire speed on the fly. I was thinking of using an optical mouse type sensor. Any suggestions for components that would be relatively easy to integrate?

thanks!

If you search for "optical flow sensor" you'll get the results you want. Still a mouse sensor but with a proper lens and handy stuff.