3D Printer Shutdown Timer, Auto Off Switch

I wanted the ability of a simple addon module that could shut the printer off after its done doing a print BUT i also wanted it to wait for a while to allow the printer to cool down with the fans running before it gets shut off so i came up with this. Most of the time when i do a long multi-hour print i will start it before going to bed and let it crank away through the night, but the problem is i might not be up before its done doing a 6 hour print and i don't want it sitting idle for a couple hours or more after its done, or all day if i start a print before leaving the house.

So here it is, Its a FRM01 Timer Relay Delay Module that i picked up off of eBay, i couldn't find them anywhere else online so i will link it here from the seller i bought mine from.

http://www.ebay.com/itm/DC-5V-12V-24V-Multifunction-Self-lock-Relay-PLC-Cycle-Timer-Delay-Time-Module-/261610018926?pt=LH_DefaultDomain_0&var=&hash=item3ce92c186e

If you source these anywhere else take note!!!! Ther