The difference is that the printer builds a three-dimensional scaffolding out of a sugar-based material called a hydrogel.

VOA: special.2010.10.19

For people interested in new technology, a New York based company,Makerbot, sells kits to people who want to build a small 3-D printer.

VOA: special.2010.10.29

As a young man, Whitman worked as a school teacher, a printer and a newspaper reporter.

VOA: special.2009.04.12

The area where the original image was drawn will then attract the oily printer's ink.

VOA: special.2009.09.02