Ultra quiet belt https://imgur.com/gallery/OAxQg
Has anyone tried a belt like this they make them in 16mm
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you need special pulleys
Im sure you could 3d print some
not motor pulley 
In addition, just looking up standard htd 5m belts, they are expensive, (not even considering student discounts). Your better off looking somewhere else.
Only time mcmaster-carr is good is for sponsorship of school projects, unless you buy a lot to keep costs down…
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Why the herringbone pattern? That’s just expensive to produce for pulleys