[bmurray7jhu]

What type of printed parts were you selling?

[martin_a]

Here's what I can say: It's an accessory for the caravaning/vanlife scene. Nothing obscene, nothing legally critical.

[weaksauce]

is it some kind of safety item?

[martin_a]

See "edit2" in OP.

I was very careful not to advertise the part as "the one solution" for any security problem.

That was mostly out of fear of liability, but I also wanted to make people think about whether the part would really help them with a specific problem or if it was just a gimmick.