This is an extra part for the Filament extruder puller ( http://www.thingiverse.com/thing:677144 ). Sometimes the filament is wandering to the side of the pully. This extra wire guide makes the entry smaller holding the filament in the middle.
After you put the filament through the puller, you put on this extra guide to limit the filament side movement.
Can be printed from pla. The hot filament will not melt it.