Your printer is instructed to print only when ALL THINGS ARE WELL with your printer ((proper) paper installed, all cartridges operational, no paper jams, etc.) - because the ink is expensive. If all is NOT well, the printer should not work ... again, because ink is expensive. Your printer does not differentiate between your color print requests and your B & W print requests ... why? Simply because all color cartridges are use all the time when you are printing color and B&W jobs, and your printer has no way of knowing what you are sending until it arrives. Why? Because ink is expensive. Some might say Semper Paratus = always ready.
For optimum results, I always recommend using ONLY manufacturers recommended cartridges, Brother Cartridges for Brother printers, Canon cartridges for Canon Printers, HP cartridges for HP printers and so on. I do not recommend refilling cartridges nor am I a fan of professionally refilled cartridges. For myself, I use only original manufacturers cartridges and I expect and receive the best printing product my printer can produce as a result ... and yes, it is expensive. I am rarely disappointed and if they don't produce, I have a path for redemption. Further, I don't print it unless I need a hard copy which sharply reduces my expense.'
There have been occasions in the past when some cartridges reported they were empty when in fact they still has some ink in them and there are procedures you can follow when this is the case. I don't know there is a general problem like this with your Canon MF8350 (series) printer and neither does someone who posted something on the internet about their specific printer. Pictures are frequently painted on the WWW with a BIG brush - translation, there is a lot of detail left out on a lot of stuff posted on the WWW.
Now then, if there is somehting about your MF8350(series) printer ink use on the Canon site ... that is different. Check it out at www.canon.com/support
See what if anything Canon recommends. Before you do all of this, I suggest you go to the Printer folder on your computer (control panel/printers/) and open the specific folder for your printer - explore the options that you will find there. Very possibly, the answer to your quesiton will be found in your printer software - i.e. - resetting ink levels.
Someone will likely come here and refudiate my remarks ... and that is OK. They will tell you only a fool (me) would buy original equipment cartridges and they will tell you about their experience refilling. At the end of the day, neither my nor their exerience means a thing in your case, it is our individual experience.
The very best way to save on ink costs is to be very selective what you send to the printer. Not everything needs to be printed. Also, printers often offer "draft" mode printing which uses less ink (and looks it - it is a draft!). If you NEED hard copy of a lot of stuff, I recommend you find a dot matrix printer which uses a ribbon. While not in wide spread use these days, they are available. Be aware, they print black and white and they are noisy and compared to other printers, the print is 'chunky' and they are a little slow.
I hope I have shed some light on your quesiton, I have tried to help as you asked, and in under 500 seconds. Thank you for your question @ FixYa.com