Is the wheel suppose to have that missing piece ? I have notice a weird clunk/catching when the glowforge moves fast. I turned it off and moved the inside back and forth. When I get to the spot the catch happens I took a picture and found that small piece missing…is not supposed to be like that? Is this normal or broken ? If it’s broken can I fix it or is it something I have to have them fix or have I just lost a HUGE investment ? 
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Nope, it’s not supposed to be like that. 
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I don’t see them in the Glowforge shop, but Support should be able to help you.
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Ok thank you. There’s nothing I can DIY to fix it?
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Not that I know of.
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Ok, thank you for your help. I’m gonna go cry now.
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As most people wouldn’t have the technical ability for the degree of disassembly required to replace that wheel, I don’t think it’s considered user serviceable.
If it were me, I might try and find the missing piece, and attempt to glue it back.
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Definitely broken. To my knowledge, Glowforge does not offer replacements for that part, it has been available on Etsy by this seller, Gantry Wheel Replacement 24mm - Etsy but it looks like they’re on a break.
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There’s someone selling used wheels scavenged from other Glowforges here:
https://www.etsy.com/listing/1276479443/used-side-gantry-wheel-for-glowforge
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