Greetings,
You can refill the ink as much as you like, but there is really no need to do so until ithe level is low and you are notified to refill.
The ink containers are designed to be "dripless" but you may experience a drip when removing the ink bottle. handy items are a napkin and Q-tip. Go slowly and take your time refilling for best results:
Canon Knowledge Base - Refilling the Ink Tanks - G7020
~Rick
Bay Area - CA
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