Flex Filament Bowden extruder variant

Direct drive extruder variant for closer guide of soft and flex filament that get curved or jammed with regular direct drive extruder.

Output guide is here much closer that shoud prevent curving of soft filament under more pressure.
This should allow greater printing speeds.

Also, fan mount is added to cool down soft filament and extruder to get it harden and decrease chance of curving.