With the Input side of the LM2596 connected, power on the printer and use a multimeter set to DC voltage mode to tune the output.
Connect the multimeter leads to the + and - outputs and turn the adjustment pot on the LM2596 until the readout is 12v.
In the image the red wire is 24v + input, the black wire is 24v - return, and the yellow wire is 12v +. There is no wire for 12v negative as it is not required.
On the LM2596 side, I have soldered Dupont terminal pegs with a 90 degree bend to the input and output side. This will allow the use of female dupont terminals on the wires so they can be disconnected in the future if need be.
You can see the Dupont connectors on the input side. Unfortunately, the Dupont plugs are non-locking and are prone to disconnecting if tugged. So ensure that there is enough slack in the wires and that they are secured immobile to the frame.
Alternatively you could use a locking connector or solder the wire ends directly to the module.
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