Remanufactured laser printer toner cartridges and methods of manufacture by which predetermined structures internal to the toner hopper section are removed preferably by a robotic laser cutter, a volume increasing cap is provided for the modified toner hopper section and the cartridge is re-assembled to yield a remanufactured toner cartridge that has a capacity to store toner that is significantly increased in comparison to the storage capacity of the OEM toner cartridge.