Ender 2 Pro Filament Pulley

The filament pulley mounts to the top Z-axis mounting point of the Ender 2 pro, you will need a 50mm long M2 bolt to replace the factory fastener along with a 6801 bearing 21mmx5mmx12mm (O.DxThkxI,D).

The pulley allows the filament a better entry angle into the extruder when using the stock filament holder. Works well with an auto rewind spool holder also. 

Edit: V2 added to files which has a slightly deeper v-groove, with larger sidewalls to minimize pop-outs.