Customs Minister Maurice Williamson says he is extremely worried about what 3D printers will do to border security.
Mr Williamson says the printers are actually manufacturers of products and 3D computer files can be emailed or downloaded from the internet.
He says household printers will soon be able to produce drugs and weapons, and the country's borders are extremely vulnerable.
"If people could print off ... sheets of Ecstasy tablets at the party they're at at that time, that just completely takes away our border protection role in its known sense."
Mr Williamson says the printers will become as common as PCs and he has asked his officials to think hard about how to keep up with this kind of technology.