Great Flat Wire!!!
I started off recently with Flat Wire from two other manufacturers. The 0.8mm x 0.2mm from one was way too springy and hard to work with, and their SS316L wasn't up to the task. The 0.9mm x 0.3mm was nowhere near as springy, but the 0.3mm thickness takes a while to heat up and cool off, making it somewhat unpreferable for my TC builds. So I wanted to try a 0.1mm thickness and found it here at WireOptim.
This 0.8mm x 0.1mm Flat Wire is Great! It's just springy enough that to wrap 3mm ID coils, I have to wrap it on a 2.5mm coiling tool, then twist the wire down onto a 3mm tool. Then just mount it and it stays pretty well at 3mm.
Being only 0.1mm thick, it heats and cools very nicely. Pulling the cotton through while building does mess up the spacing just a bit, but the time and effort to get the coils spaced perfectly again is well worth the time and effort spent. I do it with an X-Acto blade.
This is my wire of choice now. My order was filled promptly and shipped quickly.
The only thing that would make it better would be to have 8 holes all the way around the outside of the spool, to tie off the wire when done. I had to drill them myself. Other than that, it's perfect, IMO!
Thank you, WireOptim!