What are called nanosaws, nanocombs and nanowires can be grown (self-assembled) from cadmium selenium. A study of the temperature and pressure conditions were systematically varied and the impact on the growth was determined.
The nanosaws and combs seem to be 2 microns wide.
I think the nanowires are a few nanometers thick.
While this is still at a larger scale than molecular manufacturing systems...achieving greater control of 3 dimensional structures is an improvement towards top down control.
they use a vapor-liquid-solid process.
the work was done at georgia tech.