As per our R2880 refill cartridge instructions: "Long term storage of printer: We do not recommend letting a printer sit unused with pigment inks installed. If you do not plan to use a printer for an extended period of time, it is best to remove ink cartridges, install a set of flush cartridges and flush ink from the print head by doing 3-4 cleaning cycles, before turning it off for safe storage. Store unused cartridges upright in a sealed plastic bag to avoid drying."
I hope this helps, please let me know if you have further questions or there's anything else I can help you with.
Best regards~ Dana