Cow Face Extruder Indicator/Feed-Wheel

It's sometimes hard to see what the extruder is doing if you are remotely monitoring it through a webcam — is it feeding, or retracting, or has it stopped completely? The extruder's movements will be more obvious if you slip this cow-themed indicator onto your extruder motor's shaft.

This feed-wheel was designed to fit the Printrbot Simple Metal, but will also fit **any motor with a 5 mm OD shaft.**

This design was derived from [Richard Schumann's *Cow* icon from The Noun Project](https://