besides the 3D rotating drum, This heater box is the core technology of the coffee roaster, some info on the heater : part no: Genecafe 230v Heater Box CRA97-003A Genecafe 230v Heater Box CRA97-004A ( Australia ) Genecafe 240v Heater Box CRA97-004A For roasters manufactured 2016 and earlier. The lead wiring is approximately 16" in length. For roasters manufactured after 2016. The lead wiring is approximately 6" in length. A01~A06: the mica shell is only 1mm thin, and easy to break. this is reason why gene is selling the whole box as an item. the aluminium case has many inner curve surfaces, with radius of 5 mm or more. buy the mica sheets are rectangular and meant to bend to the inner curved surfaces. there is quite a lot of unusable spaces inside. nichrome wire for 110V version: given 1200W ~0.8mm diameter(meas), 110*110/(2.87 ohm/m) gives 10.08 ohm and 3800mm long 4200mm ( by rough measure) est resista...