a system and process for emptying excess toner from repaired or remanufactured laser printer toner cartridges , for use in both magnetic toner and non - magnetic toner after the cartridge has been assembled and post - assembly tested . the removal of excess toner from the cartridge prevents the cartridge from “ sweating ”, i . e ., leaking toner out from the developing roller section of the cartridge and into the shipping packaging box during shipping and storage .