Fishbone gears for k8200

K8200 extruders custom fishbone gears . New gear ratio is 9/47

**Notice** If you change these gears you need to calibrate your extruder stepper motor becouse gear ratio changes little.
-
Use this tutorial
http://www.instructables.com/id/How-to-calibrate-the-Extruder-on-your-3d-Printer/?ALLSTEPS

yes it's made for solid doodle but basics are the same.

Upate 7:

Size problems is fixed now.

Thanks to balthazar for testing the gears.
I uploaded all new files these are unteste