This post is for today and tomorrow, as I have things to do and I might forget to make this post.
In one of my last post, an assisting poster had advised a student, that they might go beyond a standard size of an atom and then go down to the components or realm of the component less than a size of an atom.

I would not do this, as if the style of bots your designing, are self intelligent by swam or group mechanics, they possibly could learn to katate or chemically combine atom parts, to innervate through most solid walls?

This might mean your containment wall, that your company or university is trying to contain this active nanomaterials in.

This might mean in the real, you flapping your arms up and down, when breach of containment warning lights going off and getting a call from the military that anyone attempting to leave your facility, will be prohibited to do so, by use of lethal force.

I said, the idea size for a nanomicrobot, might lay in the range of near a virus in size anywhere to an approximate plus size and upward, of a bacteria?

If you convulate low and start using parts of the atom, this feature that you've added to your micro-nano-bots, might give them the learned ability to inter-phase with matter, of their own free will and they might be able to develop the ability to pass through most sorts of matter.

Depending on what type of design these micorbots would be, they might end up unstoppable...?!