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Hopefully this develops into a handheld, so I can use this to paint the walls in my house without spending hours taping.

There are a lot of (quite limited) handheld ink printers on aliexpress ))

I searched but didn’t come up with anything I’d buy. Have a link handy?

This is electrostatically applied, a bit like powder coating from my understanding, so yeah, it probably won’t work on drywall.

From TFA: > the new method works without electrostatics, relying instead on jet application.

True, my bad, read the exact opposite.