it's only when you want to distribute or sell that patent legal issues arise.
patents are good, 3-D printing is even better. so long as you are not mass distributing or selling patented tech, there is no problem making something for yourself, now if friends or family want one, i suppose you can get away with making them as a gift, just make sure any $ goes into them purchasing the materials required to make it, and not for the end result and you can avoid 99.9% of legal claims unless you're using a plan you did not make or did not purchase there is no legal problem as long as something is 30% different from anything patented, even if it's just cosmetic additions or subtractions, you are in the free and clear.