4D printer - Maxwell's Angels....

so we've all heard about 3D printers, and pretty naff they are too - and soon we'll have 3D fax machines (poor man's matter transporter)

but what about a 4D printer?

This would basically extrude reality - it could be a nascent universe in a box, with an output being a stream of space time continuum - the settings (God's Dials?) would be quite complicated....perhaps the implementation would entail use of Maxwell's Angels (a bit like his demons, only without sense-of-humour failure).