I wish to directly monitor the serial-over-usb connection to my 3d printer, which runs at 250000 baud. e.g I might monitor it with `cat /dev/ttyUSB0`

However first I need to set the baud rate, e.g `stty -F /dev/ttyUSB0 115200`

But if I try and set the baud rate to 250k, it fails:

`stty -F /dev/ttyUSB0 250000`

gives result:

`stty: invalid argument 250000`

It appears that baud rate 250000 is not supported under Ubuntu/Mint. Can anyone suggest an alternative way to monitor this serial connection?