Pellet Extrusion Stirrer

30/12/2018 Added a bracket to hang the funnel from.

04/09/2018 Mahor released his marlin configuration for using an extra stepper and driver for stirring, see our discussion here: https://www.thingiverse.com/groups/universal-pellet-extruder/forums/general/topic:31110#comment-2024531
Also see ideas from the reprap community here: https://reprap.org/forum/read.php?1,831119,831229#msg-831229

This is a stirrer to stop feed stock getting stuck on its way to a pellet extruder. I built this as a