Researchers at Hasso Plattner Institute have made several 3d fabrication project with laser cutting and other methods. Here is the new one: LaserStacker where they use a laser cutter to weld together 3d objects.They even made functional scissors.
LaserStacker uses the laser cutter to not only cut but also to weld. Users place not one acrylic sheet, but a stack of acrylic sheets into their cutter. In a single process, LaserStacker cuts each individual layer to shape (through all layers above it), welds layers by melting material at their interface, and heals undesired cuts in higher layers. When users take out the object from the laser cutter, it is already assembled.
This is a project from the Human-Computer Interaction Lab at Hasso Plattner Institute.
LaserStacker is a research project by:
Udayan Umapathi, http://www.udayan-u.com/Hsiang-Ting Chen, http://www.ht-timchen.com/Stefanie Mueller, http://www.stefaniemueller.orgLudwig Wall,
Patrick Baudisch, http://www.patrickbaudisch.com