Printrbot Simple Metal Retro Feedwheel

I really liked the design of ei8htohms "Olde Timey Spur Gear for Printrbot Extruder" (thing:163975) so I adapted it for the Printrbot Simple Metal.

Made it a bit smaller and thinner, because it's now just an accessoire.
Also added a mount for the shaft of the extruder. (Holes are actually a bit too big in the files, but came out just right with my simple metal.)

Printed in colorFabb Traffic Red PLA/PHA.