Brother HL 3070CW - Manual (Page 77)

Driver and Software
67
2
f
Choose USB.
g
Choose the printer name and make sure that Brother is shown in Printer Model (Print Using).
Select the printer name that shows BR-Script in the Model Name (Model), and then click Add.
For Mac OS X 10.3.9 users:
For Mac OS X 10.4.x users: