Epson WorkForce AL-MX300DN - Manual (Page 190)

7. Place the printer onto the optional paper cassette unit. Align each of the printer’s corners with
those of the optional paper cassette unit. Then lower the printer until it rests securely on the
optional paper cassette unit.
8. Secure the printer to the optional paper cassette unit with the two screws.
AL-MX300 Series User's Guide
Installing Options 190