Yes you can however unless you get it free I wouldn't bother with the DTD check in plus it wastes time when you could be having fun. There have never been any queues to do bag drop at MCO and bell services will store your cases until you are ready to leave.
You never need to print boarding passes - they will always print them at the bag drop desks.
We checked in on my iPhone using the virgin app and then printed our boarding cards off when we got to Orlando international when we went in May, found it really good!