So that the Community can help you better, we will need to know exactly what model printer you're using (it's usually on the top or front of the unit), any error messages you're seeing, which version of the macOS you're using, as well as the way you connect to your printer (USB or networked via WiFi or Ethernet).
Any other details you'd like to give will only help the Community better understand your issue!
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How annoying that Canon isnt supporting those of us with Macs. Not being able to print in draft on airprint means I won't be replacing my broken printer with a Canon.
From what I understand Canon previously provided downloadable software to be able to do so. Shame they've stopped.
If it's not that critical to stick with the 'Airprint' driver which apparently has fewer features comparing with Canon's original driver, I encourage you to print wirelessly via the original one instead. Just download MG3600 series CUPS Printer Driver Ver. 126.96.36.199 (Mac) from their website and install on your Mac.
At System Preferences > Printers & Scanners just click '+' to add a new printer driver (you may keep the existing printer (via Airprint) that shown in the list.
Choose the Canon printer which found through 'Canon IJ Network' instead of 'Bonjour Multifunction', at the 'Use' box, choose Canon's original driver instead of 'Secure Airprint'. Don't forget to change the 'Name' of the printer to indicate that this one is not using the Airprint.
With the original driver, you have more control on the printer like 'draft printing' and other Printer Utility like cleaning, etc.
Hope it helps.