The invention relates to a printhead module assembly for a pagewidth printer system. The module assembly includes a printhead integrated circuit (IC) manufactured using a micro-electromechanical systems (MEMS) process, and a flexible printed circuit board electrically connected to the integrated circuit for supplying power and data thereto. The module assembly also includes a top channel layer supporting the IC, the top channel layer defining a number of slots therein, and an upper layer defining holes that are aligned with inner parts of the slots of the top channel layer, the upper layer further defining a number of channels. Further included is a mid layer defining a number of holes which are aligned with ends of the channel in the upper layer. A lower layer defines channels for supplying ink and compressed air to the IC via the layers such layers stacked to form an ink distribution assembly.