CustomHappy began as a family venture at a kitchen table in 2015, when sisters Rachel and Jacquelyn started selling mugs before moving into a Pennsylvania production facility. Today, the company supports small businesses and larger sellers with personalized production and fulfillment, handling orders from single pieces through high-volume runs. Its 12,000-square-foot operation grew from producing 1,000 mugs a week with a 30–40% error rate to more than 1,000 a day with an average error rate of about 3%.