Smart people of Uni Postdam made this hand guided laser cutter. User draws with laser pointer and laser cutter follows the path. There are different laser pointer types for different materials which trigger different operations by laser cutter.
Project homepage:
http://www.hpi.uni-potsdam.de/baudisch/projects/constructable.html
Detailed paper in PDF:
http://www.stefaniemueller.org/wp-content/themes/f8-lite/images/constructable/2012-uist-mueller-lopes-baudisch-constructable.pdf
Project homepage:
http://www.hpi.uni-potsdam.de/baudisch/projects/constructable.html
Detailed paper in PDF:
http://www.stefaniemueller.org/wp-content/themes/f8-lite/images/constructable/2012-uist-mueller-lopes-baudisch-constructable.pdf