Don't think I've seen this before. Don't even think the author has things for sale from what I can tell. Couldn't find an obvious option on any of my models to toggle this either.
Anyone know what's going on?
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Some aspects of Printables are "wrong". Contests are a total mess at the moment. I might make a serape post about it.
This? Looks like a glitch/bug. As far as I can tell this is only active on paid items which makes sense.