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.
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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 untested with printer, but they are tested in 3d program.

Update 6:

Uploaded design without "k8200" text for those who like it more without text.

Update 5:

New V3 version uploaded. minor fixes. now 20% smaller so it fits better to k8200 extruder.

Update 4:

Finally fixed problems. Fully working teeths.

Update 3:

Majore flaws in teeth dimension. Fix coming soon.
It wasnt good idea to upload before testing. Sorry for inconvience.

Update 2:

Uploaded fully working model of