Printing from CHM is horrid and for the reasons you are encountering.
You are better off supplying a PDF of the document and offering that if users desire print.
I think there is a solution in Snippets on my site but it is horrible and involves having the CSS in every folder. I agree with Rick if you feel something must be offered.
See www.grainge.org for RoboHelp and Authoring tips
Is there an easy way to turn off printing option from the topic directly?
Unfortunately, this is built into the CHM and you don't have control over it.