Adding powder to original consumables depends on what consumables are.Some brands allow adding powder, and the powder box is designed with a powder adding mouth.But most brands don't allow users to do it themselves[Detailed]
All the original and genuine consumables have passed the quality, emission and electrical performance tests of the national inspection agency before they are launched, and only those qualified can be admitted[Detailed]
1. Expensive2. You can't expect HP's products not to be wasted - there is 30-50g toner in the toner cartridge, but the printer is short of ink - this is a common fault of HP.