Homemade solder iron,will need's wires and wires, and patience. 
First, we will need two wires twist as a thermocouple.
Thermocouple Tutorial
https://www.youtube.com/watch?v=AubXDi6AD2M#t=4.432784
EEVblog #419 - Thermocouple Tutorial
https://www.youtube.com/watch?v=AYbl...k#t=350.751237
Second, one high Resistance wire as heater element.
Teardown of a thermally controlled soldering iron element.
https://www.youtube.com/watch?v=g78f-tJ666c

First, we will need two wires twist as a thermocouple.
Thermocouple Tutorial
https://www.youtube.com/watch?v=AubXDi6AD2M#t=4.432784
EEVblog #419 - Thermocouple Tutorial
https://www.youtube.com/watch?v=AYbl...k#t=350.751237
Second, one high Resistance wire as heater element.
Teardown of a thermally controlled soldering iron element.
https://www.youtube.com/watch?v=g78f-tJ666c
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