An information processing apparatus includes a communication interface and a controller. The printing device is configured to print on a printing medium. The controller is configured to perform a service provision process for providing a service utilizing a printing device. The controller is configured to perform the service provision process using individual information of the printing device and contract identification information associated with both the individual information and service information related to provision of the service. The service provision process includes: (a) registering a user in association with contract identification information associated with individual information of a first printing device; and (b) when the first printing device is replaced with a second printing device and the provision of the service is continued utilizing the second printing device, associating individual information of the second printing device with the contract identification information associated with the user registered in the (a) registering.

A printer including a medium support surface provided with through-holes in connection to a suction chamber assembly, a pressure regulator assembly configured for selectively connecting the through-holes to a suction source or an overpressure source for respectively drawing in gas into or blowing gas from the through-holes and a user interface for user interaction. The pressure regulator assembly is configured to activate one of a plurality of pressure states, and the user interface comprises a user operable digital item provided with a plurality of digital states which one-by-one correspond to the plurality of pressure states of the pressure regulator assembly.

An ink jet system includes a recording device on which a head unit that ejects ink is mounted, the recording device performing recording on a recording medium, a processing device connected to the recording device and performing a data process for causing the recording device to perform recording, and a server connectable to either the recording device or the processing device, wherein either the recording device or the processing device includes a receiver that receives a control parameter from the server, a controller that controls an ejection operation for ejecting ink from the head unit based on the control parameter, and a reception unit that receives evaluation information indicating an evaluation result obtained by causing a user to perform evaluation on one or a plurality of evaluation items of the control parameter in N levels of three or more after the ejection operation.