Hi,
after good and bad luck with magnet wire (=enameled wire) and very small litz wire (multistranded insulated wire) in micromodels, I successfully tried flexprint cable (i.e. the stuff found interconnecting commercial PCBs etc.). Some of these cables are excesssively temperature sensitive, simply melting away when you attempt to solder to them, others can be soldered quite nicely.
Scratch off the insulation (which is usually quite tough) on one side to expose the actual trace and directly solder to that trace. In my current model, I also made use of the connecting end: I liberated a matching connector from a computer PCB by heating the area around the connnector with a heat gun and then smacking the PCB to make the components fall off. The flexprint wire in this picture has 0.9 mm pitch. I use the connecting end to attach my programmer (and bus analyzer) so that I can reprogram and test the 3 microcontrollers (will be 5 when the model is complete) in what is going to be a 1/87 scale wheel loader (BTW: the frame is not soldered but held together with M1 and M0.8 screws). The image shows a US cent and a Euro cent for comparison. The small "pig tail" in the top part of the picture is a nylon thread which makes it easier to unplug the rx module.
I believe this is a very worthwhile technique to explore.
Regards,
Fred
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