Nanomachines for building structures

What sort of structures? Nano bots are typically 50 nm in size. Even a swarm of them cannot build much of a structure. They are mostly being tried for drug delivery, cancer treatment and such biomedical applications.

I was thinking of possibly using it to build structures on the nano or micro scale. For example carbon nanotubes or graphene transistors. I'm just not sure of how they would dissassemble materials then move the atoms to assemble them in new locations.

Some background info is available here does indicate that these can build tiny electronic circuits:
<a href="https://www.microscopemaster.com/nanobots.html" target="_blank" rel="nofollow noopener noreferrer">Nanobots - Uses in Medicine and Industry - Engineering and Drawbacks</a>
An interesting application here:
<a href="https://www.dailymail.co.uk/sciencetech/article-3514281/Could-nanobots-make-electronics-FOREVER-Molecular-machines-repair-damaged-circuits-devices.html" target="_blank" rel="nofollow noopener noreferrer">Could nanobots make your electronics last FOREVER? | Daily Mail Online</a>