If anyone is having problems with this error 300 and you are running Catalina, see this other forum post to see if it addresses your problem: https://community.usa.canon.com/t5/Printer-Multifunction-Support/Compatibility-of-Canon-MX870-amp-MG5620-wit...
SUCCESS!! Thank you so much for the help dm1723!! It is definitely possible to easily set up a new Catalina mac with the Canon Pixma MX870 printer. Here were my steps, hoping to pay it forward to someone else with the same problem.Full credit to htt...
This is great news! Is there any way you could provide a little more detail as to how I copy an old driver and transfer it to my new computer? This is exactly the answer I was looking for, but now I'm stuck again...
