Filament feed drive guide for Wanhao Duplicator 4S

Filament feed guide block with tighter hole and better tolerances to reduce jamming/kinking when printing with tricky materials such as flex or PA.
Print in ABS or PA for heat stability. PLA might not be stable this close to hot end, and that would make an unholy mess!!
Check out my quick-change fan carriage for easy access to the drive and hot end. http://www.thingiverse.com/thing:588138