Primo 9mm belts vs 10mm belts

Mostly Printed CNC - MPCNC Advice
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I have gotten the primo kit fromV1 sized for a 20x20 cut area. I measured 3 times and cut once on my Y belts, but I neglected to notice that the online calculator had not recalculated from 13 inches for my 20-inch input. I think I did not hit enter to move on to the next field. As a result, my Y belts were way short. OK, so I will go buy some more. I looked at the Amazon link for the gt2-9 belts from the parts list page, but I then neglected to notice that Amazon returns a 9mm belt and not a 10mm belt. Since this is my first build, will this 1mm belt to pully/idler difference cause me issues?

I see in the previous posts that people have used 6mm belts and pulleys, but I think I appear to have done something slightly unique.

Any thoughts?

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It looks like the Amazon link needs updating (as of right now it is https://amzn.to/2V5pfo8). 10mm belts are not hard to find and you should use those instead, although if you had accidentally purchased a 9mm belt it would probably be okay.

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Cool. Thanks for the reply! I will continue with the 9mm Y belts and reply back if any negative effects are noted.