Here's an article about current ideas to deploy 3d printers of  future manned missions to Mars.

It points out the problem of transporting masses of filament  (or other printing material)
Have a read.......

http://gizmodo.com/3d-printing-tools-from-martian-dust-will-one-day-help-u-1794507348

I think the most interesting thing is that there is a belief that up to 90%of local material could be used, substantially reducing the amount of, and therefore the transport costs of, the printing materials.

I'm sure it would be easier to send a giant 3D printer up there to build stuff than actually build it here and send it.