tinkerer

a person who regularly or occasionally engages in an activity as a pastime rather than as a profession he's been tinkering with cars since he was a kid, and now he's a tinkerer who knows nearly as much as a mechanic Synonyms dabbler, dilettante, hobbyist, layman, nonexpert, nonprofessional, potterer, putterer, amateurRelated Words all-rounder [British], generalist, general practitioner, jack-of-all-trades; aficionado (also afficionado), buff, devotee, enthusiast, fanAntonyms authority, expert, pro, professional, specialist