You are _not_ getting one of these for less than $300, and because of this post and many like it, there are countless scams selling just cases for them at this price from a dollar or two of filament.
If it's advertised as a case and it works, why is it a scam? I don't own a 3D printer, nor do I know anyone who does. If someone is designing, printing, and selling a useful product, why is that a scam?
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This always makes me ambivalent about enthusiast blog posts. Like on the one hand, cool that the knowledge gets spread. On the other hand, whenever one gets popular, another hidden gem skyrockets in price or becomes semi-permanently low in stock.