Anet A8 friction-less filament guide

Here I decided to use a big screw for the major friction point. I also screwed the guide in to the printer top using one of the existing LCD screws. This filament guide replaces one of the pillars for the LCD screen.

I have to use a big screw with large thread pitch, so that the 1.75 filament could go nicely without scratching.

Main drawback - you need an extra screw. I used:
Length: 37 mm (can be 12 mm less, so 25 is probably minimum)
Outer diameter: 5 mm (can probably be less, 4 mm wil