a lot in garbage bin

Looks like the use-and-throw cartridges philosophy of companies is backfiring, making it easier to make an Open Source one.
They'll probably try to sue for reusing their stuff.

But I guess, now I get another reason why picking out of trash is criminalised in the US.

As JustEnoughDucks said, this is pretty "cheated".
Specially the cartridge part, which I considered to be the main barrier to entry.
In fact, the main reason I went through the article was to find out how they managed ink delivery. Hopefully someone tries that part too.