Reply To: How do you make round holes in square objects, or visa versa?

You have to activate the Looptools in the File/Users Preferences/Add-ons and type ‘Loop’ in the searchbox.

Per cose più complesse, cerca YouTube per il ‘modificatore booleano’

The Italian words are a mouse joke, I did it with Google Translate. It should read : For more complex stuff search YouTube for the ‘Boolean Modifier’ 🙂