Bigger diameter drive gears

Hi,

I'm working on the "2 drive gears in one extruder" idea which hasnt gotten much attention lately. The issue Im having is due to the small diameter radius of the existing drive gears its really hard to find small enough cogwheels or pulleys and belts to drive two axis that are so close together. A bigger drive gear would take more force to move it would also increase the contact surface on the filament. So before I start working around this and make the system more complex I want to make sure that there isnt a drive gear with >20mm diameter out there.
Anyone ever seen something like this?

Cheers

Do you mean the filament drive gear that you fit directly onto your stepper motor?

Then the MK8 would be very good for you. Otherwise, I'm probably not understanding what part exactly you mean. Got an image to explain?

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http://www.marinusdebeer.nl/

Yes an MK8 with double the diameter.

get one of this:

[www.aliexpress.com]

Drill few holes around shaft hole, print an adapter for the stepper and file every single teeth you can ask the supplier to make it 5mm bore.

any spur gear will work as long as you file each teeth to proper size. (don't want to be in your shoes).......