Powerless Nema 17 Upgrading Power With MK8 Gear Extruder

I have a nema 17 motor and MK8 extruder. Unfortunately my nema 17's power is not enough to turn and push the filament. I desided to make printed extruder with herringbone gears by using the motor and mk8 extruder's gear.

Printable Parts:
Body
Tensioner
9 Teeth Motor Gear
45 Teeth Extruder Gear

Needs:
MK8 Extruder Gear
3 Piece 5x5x16 Ball Bearing (625rs, 625zz or any tipe of 5x5x16 bearing)
M3 Bolts For Nema17
M5x55 Bolt
M5x40 Bolt
M5 Nuts
M5 Washers
5mm Diameter 10mm Pin
15mmX