Inner function not printing this value? [duplicate]

Question

Want to see why printName() function console.log not printing the value? What is the value this holds?

const person = {
    firstname: 'John',
    lastname: 'Muir',
    name: 'hello',
    fullname() {
        const name = 'Tim';
        this.name = 'Tim';
        console.log(JSON.stringify(this));
        console.log('First name ' + this.firstname);
        console.log('Last name  '+ this.lastname);

        printName = function () {
            console.log('name again ' + this.name);
        };

        printName();
    }
}

    person.fullname();

Output

{"firstname":"John","lastname":"Muir","name":"Tim"}
First name John
Last name  Muir
name again undefined