Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Canon's scam

this printer did a reasonable job for me for few months. I even printed photos with it and was satisfied with the quality. However, while it was stil under warranty, it started printing purple instead of red, and then a little later no black ink was being printed at all. Well, turns out the problem was the "printer head". Notice that the printer uses printer head model BC-21e and compare it's price to the printer itself. Conclusion: this printer is worth about ...(at the time of this review). Hopefully some company will read this and make a generic printer head of Canon printers...