Disclosed is a sheet buffering and inverting device having a sheet transport path and multiple sheet inverter paths extending upward and/or downward there from. Sheets being transported through the sheet transport path are selectively diverted into the sheet inverter paths, held, and subsequently fed back into the sheet transport path such that they are inverted. Optionally, an additional sheet transport path can branch off the sheet transport path upstream of the sheet inverter paths and can connect to the distal end of each of the sheet inverter paths to allow sheets to be buffered without being inverted. This device can be incorporated into a discrete module of a modular printing system to ensure sheets are properly merged and oriented after processing by multiple printing engines. Alternatively, it can be incorporated into a standalone printing system to ensure sheets are properly buffered and/or inverted prior to processing by a single printing engine.