HICTOP filament feed improvement.

If the filament on the spool becomes tangled while printing on an HICTOP Prusa i3 style of printer, it could be caused by the filament being pushed back as the X carriage moves from left to right. This movement changes the distance between the extruder and the filament spool.
Obviously, as the distance increases more filament is pulled off the spool, as the distance gets shorter the filament is pushed back onto the spool. If the spool is full this extra filament may cause the returning filamen