The Extruder - Printing in Plastic: Build Your Own 3D Printer - page 254

Figure 14-14. Both lead wires and extension wires soldered to the heater core

■ Note The extension wires are important; the heater core is going to generate a lot of heat and the PTFE

extension wires have a coating that will resist that heat. Standard shielded wire (speaker wire) won't handle the
heat, so the extension pieces provide a place to connect to regular wire without worrying about the high
temperatures.

The last bit of soldering will be done to add two 12” lengths of 20 gauge stranded wire to each of the
extension wires. Cut the two 12” lengths (we used one black wire and one red wire, but the colors really
don't matter here) and strip 1/4” or so from one end of each wire. Solder one wire to each of the
extension wires, as shown in Figure 14-15.