Whilst traditional production methods are still used for mass manufacturing, the more niche markets are turning to 3D printing as a way of producing large quantities (by boutique market standards) as the cost remains lower than the often unapproachable investment of tooling.
Another use of 3D printing is to create plastic moulds, although they won’t last forever these can be an efficient small scale production method and allow for a means of testing before large scale manufacturing. This ensures accuracy of parts and moulds before spending copious amounts on metal tools.