Filament guide for Printrbot simple with a wooden extruder assembly

I had an issue where my filament kept going left or right of the hobbed bolt. With this filament guide it disappeared! just print and then assemble the guide onto the white plastic tube which is around the axis of the filament 'locking' system.

UPDATE: It is advised to print this at a layer thickness of 0.1mm otherwise the sides of the filament guide are quite weak.