How can I delete printer history from my IMac?

Hi Lavey

Not sure exactly what you mean by delete printer history?

If you want to delete an old printer?

Go to: Apple > System Preferences > Printers & Scanners > highlight the printer in the sidebar list and click the - button.

If you want to delete failed or paused printer jobs?

Go to: Apple > System Preferences > Printers & Scanners > select Open Printer Queue... and delete any failed or paused jobs.

If you want clear out everything and re-add an existing printer or add a new printer?
see > macOS Sierra: Reset the printing system

Dennis

Old printer and scanner software is kept in the System and User Library > Printers folders, but they are very small and so there is no real value in eradicating them.

You're welcome!