I had problems uploading the model the first time, I hope this time it works fine.

This heating device utilices silicon heating strips for a uniform and fast heating. The Case is made from a single piece of ABS plastic made by plastic injection. ABS is used because of its low price and high impact and heat resistance compared to similar polymers.
The case closes with "clams", the use of "clams" allow the device to be transfered to other foamguns.
The silicone rubber hot plates have advantages of thinness, lightness and flexibility. It can improve heat transfer, accelerate warming and decrease power under the process of operation. Fiberglass reinforced silicone rubber stabilizes the dimension of heaters. More information:
http://www.alibaba.com/product-gs/533775698/Silicon_Rubber_Strip_Heater_Band.html
http://www.alibaba.com/product-gs/483455078/110_220V_200W_silicone_strip_heating.html
http://www.alibaba.com/product-gs/532913752/Silicone_rubber_heating_strip_with_CE.html?s=p