So 8mm rod is prohibitively expensive anywhere that I’m lucky enough to find it. Most industrial places and metal shops near me just flat out don’t have it.
I figured that I would pick it up off of wish or AliExpress since my gf is always ordering off of there and there was a bunch posted at $4 each.
Of course when I put in how much I needed there wasn’t a single place that could get me what I need under $100.
My second best option is to spend about $33 on O1 drill rod. The accuracy should be far better than needed and I imagine that it should be plenty rigid in the lengths required.