xyz_cell: Max, Kwang, Ilan
   digital_assembly: Scott, Marcelo, Keywon
   active extrusion: Jonathan, Steffen
   active elements: Skylar, Kenny, Taro

   architecture: Steve
   server: Neil
   CAD (factor graph -> math string): Neil
   rendering (math string -> oct-tree -> graphics): Scott, Taro
   CAM (oct-tree -> toolpath): Steve
   virtual machines (toolpath -> motion control): Ilan
   user interface: Taro
   networking (motion control -> motion controllers): Neil
   embedded Web services: Neil
   microcode (network -> I/O): Ilan, Taro
   PCB design and fab: Marcelo, Neil
   power electronics, motion control: Kwang, Neil
   sensing, input, feedback: Keywon
   motors, actuators: Max
   bearings, guides: Max
   mechanical structure and materials: Steffen, Marcelo
   extrusion: Jonathan, Steffen
   machining: Jonathan
   laser/EDM/...: Kwang
   external assembly: Scott 
   internal assembly: Skylar
   ordering, parts: Keywon
   scaling, fundamental limits: Joe
   accessibility, dissemination: Leah