Ender-3 Bearings Filement Guide

remix from anubis86's soft Bowden Filament Guide without Cable holder https://www.thingiverse.com/thing:2973535 and
FourDogs's Filement Guide https://www.thingiverse.com/thing:2897367 bearings concept.
using a small 1680 Bearings replace 608.

7/8/2018
add body for barings 608.
add donut replace bearings. not recommend. more Friction than bearings..