Raspi:
[('/dev/ttyACM0', 'ttyACM0', 'USB VID:PID=2341:0042 SNR=REDACTED')]
Obviously replace REDACTED with my 20 digit serial number.
Mac:
[('/dev/tty.NXT-DevB-1', '/dev/tty.NXT-DevB-1', '/dev/tty.NXT-DevB-1'), ('/dev/tty.Bluetooth-Modem', '/dev/tty.Bluetooth-Modem', '/dev/tty.Bluetooth-Modem'), ('/dev/tty.NXT2-DevB-1', '/dev/tty.NXT2-DevB-1', '/dev/tty.NXT2-DevB-1'), ('/dev/tty.SCH-I535', '/dev/tty.SCH-I535', '/dev/tty.SCH-I535'), ('/dev/tty.Bluetooth-PDA-Sync', '/dev/tty.Bluetooth-PDA-Sync', '/dev/tty.Bluetooth-PDA-Sync'), ('/dev/tty.usbmodem1a21', '/dev/tty.usbmodem1a21', '/dev/tty.usbmodem1a21')]
The last one is the printer.