Hi HenryAlken,
If your PIXMA iP1800 is low on ink, you would still be able to print.
If your PIXMA iP1800 states that the ink has run out, then you would not be able to print until that ink has been replaced.
When you attmept to print, what is the exact wording of the error message that you get?
Please note, Canon's Forum is not intended for immediate help, but a place to allow for the Community to give you assistance and feedback. If this is an urgent support need, please use the link below to reach our friendly Technical Support Team:
http://www.usa.canon.com/cusa/consumer/standard_display/contact_us_consumer
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