Nophead's power resistor heater block

This is the power resistor heater block described by nophead on http://hydraraptor.blogspot.com/2009/01/yet-another-quick-heater-hack.html (nophead, if you want to make a thing for this, I'll take this one down and post my pics as a copy, or I can just change the license to one of your choosing) made from the kit available from http://www.makergear.com/products/ceramic-heater-core (choose "Power resistor heater kit"). The power resistor acts as a heating element to heat an aluminum block around