In reference to the patent: US 7,877,268
I would like to make this item for my grandmother. I would not be offering it to others or selling it for commercial use. Is this legal? What issues should I be aware/careful of?
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I would like to make this item [...]. Is this legal?
No. Even for personal use, it would be patent infringement.
Are you sure, however, that your implementation would be doing everything in Claim 1? To me, Claim 1 seems ridiculously specific. It should be very easy to avoid infringement by not implementing some of the more esoteric recitations in Claim 1.