inverted bulldog extruder with mk8 drive gear with filament guide

I really liked the bulldog extrude design but it causes filament buckling on my setup. so I designed inverted bulldog extruder.
I have designed it for mk8 extruder gear(one in airtrippers drive gear benchmark). filament is guided all the way through the extruder block so no buckling occurs.

there is a 608 bearing ahead of the drive gear to push the filament to drive gear.
there should be 3mm gap between the motor and the main block to use m3x16 screws.(in my setup 3mm thickness steel plate