MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
They can but they're incredibly expensive, as in "Price on Application" levels of expensive. Selective Laser Sintering 3D printers work by depositing layers of powder and sintering (melting) the sections that are meant to be solid. The layers of powder provide support for overhangs and you just pull your printed part out of the bed of powder when the job is finished. The remaining powder gets recycled for future print jobs.