Hi pokihif173,
Blurry or fuzzy printing can be caused when the encoder/timing strip inside your PIXMA TS3720 has a smudge or ink spray.
To clean the encoder/timing strip, please follow the steps outlined in the following Knowledgebase Article:
Cleaning the Encoder Film - TS3700 Series
If you continue to have difficulties, please contact one of Canon's Technical Support Representatives via phone or chat. To contact a Technical Support Representative, please use the link below to log into your My Canon account:
https://mycanon.usa.canon.com
Once logged in, click on your PIXMA TS3720 and then click on the Product Support button. When that page loads, click on either the Phone Support button or the Chat Support button to access support.
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