Right now we have a consumer culture that doesn't really teach people to make and repair their own things (which is what a 3D printing would mostly be useful for).
Mass production killed the repair business, unless it's really expensive they just come cheaper off the assembly line than having a repairman with the skills, parts and tools fix them one item at the time. I don't think I could find a seamstress or cobbler anymore if I wanted to repair my clothes or shoes, at least I'd have to search far and wide. I'm sure a tailor would do it for way too much money but it wouldn't be cost efficient. Same goes for my furniture, if anything breaks it's almost certainly easier and cheaper to replace than repair. Small electronics repair has died entirely, cars and houses are still expensive enough to repair but not much else. Particularly if you're not really sure if it's properly fixed or the repaired part is weaker than the original and taking into account that the item is worn and likely to break again sooner than a new one.
Not that it's just repairs, in many areas you're so outpaced that being self-sufficient is more expensive than at the store. Like for example my dad and I used to chop firewood, but now we buy it and if you add up the raw material cost (owning a forest patch), the production costs (chain saw, blade, chain, fuel, oil, protection gear, cleaver, transport) and a modest self cost for your time (getting there, felling, cutting into pieces, transporting to the road, cleaving, getting it home, stacking for drying) it's still cheaper to work, pay taxes and buy firewood from a company that drives around with big forest machines and creates more firewood in an hour than we can manage in a week. Customization is really more interesting and worth a premium, but it's rarely combined with the urgency of needing it from my own printer. Or if it's that urgent, I probably can't wait for the printer.