For MG3500 series printers, v3900 is better because it's specifically designed for that series. For older MP and iP series printers, v3400 may be the only compatible option. Choose based on your printer model, not version number alone.
If you own a supported printer and are technically comfortable with the risks, v3900 can be an excellent solution. But if you're looking for a simple "download and click" experience, you'll be disappointed—and potentially harmed. canon service tool v 3900 free download better
To use the Service Tool V3900, you must put the printer into first. For MG3500 series printers, v3900 is better because
: Clearing "Waste Ink Tank Full" errors. For MG3500 series printers
Click the button. The printer will perform a quick operation, and the counter will reset to zero.