In the first video, Tom describes design and basic parts printing.
Here is the fully 3D printed flying wing being developed and tested:
The aircraft was printed from clear PLA filament with a 0,4mm nozzle at 220 degree Celsius to maximize the layer strength. Weight of the aircraft was 730g.
Visit Tom's Thingiverse page and download the files: http://www.thingiverse.com/StantonFrames/about