In the world of printing, there are two types of machines: those that can "think" for themselves (PostScript/PCL printers) and those that need their hands held by the computer (Host-based printers). The MP250 is the latter. It relies on your Mac's processor to do all the heavy lifting of "rendering" the image into a map of ink dots.
Since Apple dropped support for 32-bit software back in 2019, the legacy 32-bit driver that the MP250 requires simply cannot run on Sonoma 14.83. Even if you "force" a Generic PostScript driver onto the connection, the MP250 doesn't have the onboard chip to understand those commands. It’s like trying to give a recipe in French to someone who doesn't speak the language and doesn't have a kitchen—nothing is going to get cooked.
The Practical Path Forward: At this point, you are fighting a battle against hardware architecture. To get back to a seamless workflow—especially for specialized tasks like envelopes:
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AirPrint is Key: Modern Canon units (like the TS or TR series) use AirPrint. This is a "driverless" technology that will likely never go obsolete as long as you're on a Mac.
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Loyalty Discount: Since you have a retired unit, the Canon Upgrade Program is specifically designed for this scenario. They can set you up with a modern unit that handles Sonoma perfectly.
You can reach the upgrade team at 1-866-443-8002. They're available Monday through Friday, 9am to 6pm EST.
