I made this big holder for my insulated water bottle on my ebike. Used M3x20 bolts to hold the cup and M5 bolts and nuts for the main holder and handlebar grip. You might need some rubber to fit smaller handlebars, but it works great for me.
I think 3mm will be too small, 5mm seems as small as you would want to go.
And FYI, I should have made the arms out of TPU also, my heavy water bottle broke the first set that was PETG.
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