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Yes, and that's precisely why that one works, he's got the numbers figured out.

Still, six figure income, but what is the margin?

Looks very good though. And: very, very hard to injection mold that product (internal structure is something 3D printers excel at).

Internal structures often require support. This makes postprocessing necessary which kills your margin or makes the part expensive.

that single succes story doesnt impact this situation though

What the fuck is this? What even is a can holder for?

They're used to keep a soda or beer can insulated, typically when drinking the beverage outside during hot summer months.