Learn Spanish (Latin America): Voy a volver a imprimir estos archivos.

They belong to two different grammar patterns that happen to be chained together here! The first a belongs to voy a (I am going to). The second a is a required part of the phrase volver a (to do something again). You simply link the formulas: Voy a + volver a + imprimir.

Doesn't "volver" mean "to return"? Why does this sentence translate it as "again"?

You are right that volver on its own means "to return." However, when you use the special formula volver a followed by an infinitive verb (like imprimir), the meaning changes entirely. It becomes the standard Spanish way to say "to do that action again." So, volver a imprimir simply means "to print again."

Why is the word for "these" estos? Shouldn't it be estes to match the singular este?

This is a very common mix-up! The singular masculine word for "this" is indeed este. But its plural form breaks the rules a little bit and becomes estos (not "estes"). Since archivos (files) is masculine and plural, you must use estos archivos.

Does archivos mean physical filing cabinets or computer files?