The disclosure discloses a printer including a controller. The controller executes a reception process, a determination process, a first notification transmission process, a second notification transmission process, a data acquisition process, and a coordination control process. In the determination process, it is determined whether any of a print formation process, a feeding process, and a standby process is executed when a first print instruction is received. In the case that the print formation process or the feeding process is in execution, a first notification is transmitted in the first notification transmission process. In the case that the standby process is in execution, a second notification is transmitted in the second notification transmission process. In the case that none of the print formation process, the feeding process, and the standby process is in execution, print data included in the first print instruction is acquired in the data acquisition process.