All library printers contain A3 paper (unless specified on the machine). 

To create an A3 document in Microsoft Word: 

1. Create a new document 

2. Select Layout  

3. Select Size, then A3 

4. You are now working on an A3 size document, and it will automatically print A3 

 
To change the size of an existing document to A3 in Microsoft Word: 

1. Select File, then Print 

2. Select Printer Properties 

3. Select Effects, then Scaling Options 

4. Scaling type: Scale to fit 

5. Print document on: A3 

6. It is now an A3 size document, and it will automatically print A3