Ender 3, CR10 filament feed bottom relocation for direct drive

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####WHAT
Relocation of filament feed for Ender 3 ( and other printers) for direct-drive setup allows feeding filament from the bottom.

####WHY
I was fighting occasional horizontal lines in prints and discover that when feeding filament from top sometimes extruder is strong enough to slightly pop X gantry up when pulling filament from spool ( located on top of enclosure in my case). So I redid feeding so the filament is fed from bottom and any force is held by thread of Z screw ( solid point)

####HOW
Easy enough, print with 100% infill, cut M6 thread into hole, and use piece of bowden tube.

Note: Other versions are for my X-Prime Ender brackets ( https://www.thingiverse.com/thing:4313356 )