UPDATE November 2020: Please use the advanced version V2, it can be found here: https://www.myminifactory.com/object/3d-print-ender-2-filament-guide-v2-143116

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A very simple filament guide for the Ender-2. It prevents the filament touching the (hopefully well-greased) z-axis spindle by keeping it away less than 1mm without bending or causing additonal friction to the filament. It also helps the filament getting more straight into the extruder, thus reducing the strain on the inlet-hole.
-no more no less :-)-

Can be installed together with the stock spindle guide bushing using the stock screws.

I found other solutions , but many of them are overkill in my opinion or complicate the filament change unnecessarily...

Update 29/01/18: after installing that little piece of plastic its also possible to mount the spool holder to the front side of the printer - this allows easier changing of spools and the printer is better balanced on its base plate due to better position of center of gravity...