Learn Italian: Posso stamparlo in ufficio, o lo devo stampare a casa? - Can I print it in the office, or must I print it at home?

Both halves of the sentence mean "print it", but they show the two different ways you can place pronouns with a modal verb (like potere or dovere) plus an infinitive. You can either attach the pronoun to the end of the infinitive (stamparlo) or put it before the conjugated modal verb (lo devo stampare). Both are perfectly correct and mean the exact same thing!

When attaching lo to stampare, why is the final "e" dropped?

Whenever you attach a pronoun to the end of an infinitive verb in Italian, you must drop the final -e of that verb. So, stampare + lo becomes stamparlo (not stamparelo).

Why does the sentence use in ufficio but a casa?

Prepositions for locations in Italian often just have to be memorized. Ufficio, like many typical destinations such as banca or farmacia, usually takes in. Casa, on the other hand, almost always takes a (just like the English "at home"). Notice that neither of them needs a definite article (like il or la) here.

Besides potere (posso) and dovere (devo), are there other verbs that let you move the pronoun like this?