Improvising a fan from a PC power supply and a computer fan

Bill of materials
Procedure

These days have been blistering hot, so I had to improvise a fan with some hardware I had at home. Here I am using a Corsair AX860 Power Supply and a 120mm Corsair ML120 fan that I had lying around.

Computer fan hooked up to a power supply!

Bill of materials

An ATX PC Power Supply
A PC fan (I am using a 120mm one)
A 3-pin fan extension cable
Short piece of wire
Electrical tape

Procedure

Cut a short (e.g. 4cm) piece of wire and stript the ends. A short piece of wire with ends stripped
Using a knife or boxcutter, cut the edge of the female end of the 3-pin fan extension cable so that it can fit into the 4-pin PWM male header of the fan. 3-pin extension with one of the sides removed
Unpin the red and yellow wires from the male connector of the fan extension. You can use a needle to press against the visible metal on the back of the connector and gently pull the wires out. Male fan header connector pins. Press with a needle to unpin each cable
Insert the short piece of wire into the 24-pin ATX cable of the PSU, as shown in the diagram below. Electrical connections on the ATX PSU. Image based on this one: click
Insert the red wire of the fan extension into a +12V hole of the 24-pin plug. Any hole marked as +12V1 or +12V2 in the diagram will work.
Insert the black wire of the fan extension Any hole marked as COM in the diagram will work. Finished connections
Connect the male plug of the fan to the female end of the extension.
Turn on the PSU. The fan should start up immediately.
If everything is ok, isolate the ends of the fan extension and stick them to the 24-pin cable holes so that it holds in place and protects you from shocks.