This is correct. From 35 USC 271:<p>(a) Except as otherwise provided in this title [35 USCS Sects. 1 et seq.], whoever without authority makes, uses or sells any patented invention, within the United States during the term of the patent therefor, infringes the patent.<p>But, as a practical matter, companies don&#x27;t go after hobbyists printing up something in their basement of course. Both because it&#x27;s prohibitively expensive versus the expected monetary recovery and it&#x27;s hard to find someone doing this if they&#x27;re just doing it in their basement for fun.