Sun, Sand, and Sintering – 3d Printing the Desert

This is fantastic – but I cry out for more information on it!  This machine (by Markus Kayser) uses Fresnel lenses and solar powered motors to focus the light and heat of the Saharan sun on to the moving bed of sand – melting it as it travels and forming a crude glass.  The bed is lowered, another layer is sprinkled and leveled, and the sintering, 3d printing, sun-worshiping, dance goes on.  But I have questions!