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Import duty is for items that will be remaining in the United States. If you'll be taking it back home with you then you should not have to pay duty on it. For example, if you were to take a personal laptop and return home with it there is no duty. Besides, you are attending school as it is so it's reasonable to assume you'll be returning home with the same things you brought in. Now since you'll be bringing parts and not a 'whole' computer, be forewarned you may be questioned about it. Make sure you have proof of purchase for the return trip just in case your home country decides to try and tax it.