This allows for mounting two extruders on a Rigidbot with hexagon hotends and 25mm fans.  I replaced the stepper with a higher torque model to improve speed.  The hexagon comes with 12v fans, so I'm using a voltage control board to step it down. There is a base for left and right, motors are mounted facing back of machine.  Top piece is same for both.  Drill out through holes to 3.2.  Fan and base mount holes to 2.5.