Losing socks in the wash was aggravating Kevin Bunn as a bachelor. Then he got married and had two children, one of whom had no two pairs that matched. He had been in the real estate business selling gyms, so he looked forward to an opportunity to use his mechanical engineering degree from North Carolina State University. That was five years and 15 prototypes ago. The learning curve was steep, both from a technological and entrepreneurial angle, but Bunn taught himself as he went. Thanks to 3D printing, he did not have to spend $10,000 on casts and molds as he would have a decade ago. The first models had too many moving parts and they were very hard on washing machines. The current model consists of parallel cords joined by a series of cord locks, the user slipping the pair of socks between the cords and clipping it with the cord lock. A plastic hook allows convenient storage in a closet or on a hamper. The new design washes silently and holds the pairs together. Bunn began selling the items before Christmas, has sold 500 to date, and is going to the International Home and Housewares Show in Chicago to try to capture the attention of Walmart or Bed Bath & Beyond.