I have 3 Brother printers and they all notify me ahead of time when laser power or ink is slow. When it's "very low" I can still override the error and print a

I have 3 Brother printers and they all notify me ahead of time when laser power or ink is slow. When it's "very low" I can still override the error and print a few more pages before ordering new cartridge that costs $10 for 1500 pages