[jacquesm]

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).

[chopin]

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