[team4384]

The channel opposite to the wheels doesn't seem to have any friction, the frisbee will slip, loose energy and not fly far enough. Consider taping friction tape or at least soft sided velcro to the inside of the channel opposite to the wheels. This grip the frisbee and the fast spinning wheels will generate spin and push the frisbee out.

You can get 3M friction tape (cloth electrical tape) at home depot for about $4 or so.