Buckmisterfullerene is often referred to as "bucky balls" because it consists of molecules of 60 atoms in a graphite-like arrangement, curved and joined to itself to form a beautiful geodesic sphere.
These nanotubes consist of sheets of graphite rolled into tubes only a few nanometers in diameter.
The manufacturing process for bucky balls and nanotubes alike can be described basically as creating soot by burning or heating carbon and carbon compounds in high-temperature electric arcs, blasting with lasers, or some other similarly crude method.
Single-walled carbon nanotubes (SWCNTs) were deposited on a transparent substrate and used as electrodes in order to grow a thin film of CP on it electrochemically.
It's not too surprising that this encourages the carbon to form into tubes rather than balls: Think soap bubbles made by holding
the ring in a strong, steady breeze.
Nanotube powder is incredibly light and fluffy!