Maynooth's better finishing, which saw them lead 0-9 to 0-3 at half-time, was the decisive factor at Maynooth.
The winners continued to dominate in the second half and Eddie Walsh's fifth score from play gave them a nine-point advantage. DIT briefly threatened a revival halfway through the half when Colin Coen scored the only goal of the game, but the winners got the last five scores.
NUI MAYNOOTH: K Ennis; C Dunne, K Fitzpatrick, P Cosgrave; R Hoban, D Hardiman, C Dooley; D Scallan (0-6), C Fenton (0-1); S Kiely (0-5), D Henry, B Condron; T Bergin (0-1), J Keane, E Walsh (0-5). Subs: D Moloney (0-1) for Hoban; J Phelan for Condron.
DUBLIN IT: E Curley; B Perry, A Ivers, W Comerford (0-2); J Cullen, C Coen (1-0), R Potts; G Curley, T Reilly; B Lambert (0-2), R Hayes, J Shaw; P Maher, D Spain, J Gleeson (0-1). Subs: G O'Connor for Gleeson; D Flanagan for Potts; D Lowry for Maher.
Referee: J Sheridan (Kildare).