Provided is a modular printer assembly which includes a housing having upper and lower covers, a first side wall and a second, opposed side wall, as well as a loading mechanism which includes a drive assembly with a traversing mechanism engaged with the drive assembly, and a pair of endless belts and roller assemblies operatively engaged with the traversing mechanism, so that actuation of the drive assembly displaces the traversing mechanism to push, or pull, the belt and roller mechanisms farther apart, or closer together, respectively. The printer assembly also includes a print engine having two opposed arcuate printheads each with a radius of curvature which approximates a radius of inlet rollers with each roller at least partially received in said curvature of each respective printhead, the print engine configured to print ink followed by a fixative onto the media operatively fed between the printhead.