Filastruder control box for motor speed adjuster

This control box is designed to reuse 2 switches that came with filastruder and motor speed controller that can be purchased from here http://www.ebay.com/itm/370962506627?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

24V power supply is not required to adjust the motor speed, but its better to have it so you can extrude 2 times faster.
With an extra 24V power supply, you can wire old one to use with fans and heater and new one for motor only. That way motor speed is consist