FWIW, you still will need to get your boarding pass printed before you can go through security or board the plane. You can do that any time starting at 24 hours before your flight. EBCI will check you in at 36 hours, but you won't be able to see your boarding number or print out a boarding pass until 24 hours before the flight.
The front desk at Disney resorts or the guest services locations in the parks and at DTD will print boarding passes for you. In addition, RAC will print them for you if you are staying at a Disney resort and use the service, or you can get them at the airport at a self-service kiosk, at curbside check in or at a manned ticket line. If you are checking bags you'll have to use one of those anyway, so there's really no time saving to printing them in advance unless you are doing carry-on bags only.