For the project Weld Stool, De Groot has collaborated with Lever Kunststoftechniek and Hubbers BV.: an industrial plastic mounting company and a company which specialized in the producing of custom fit interiors.
By researching these two companies and by joining the forces of both parties, the series Weld Stool originated. In this collaboration the welding technique and plastic material of Lever Kunststoftechniek has been used to create a strong tensioned seating surface. The sophisticated custom fit of the wood and the various cutouts of the pattern pieces are executed by Hubbers BV. The form is achieved by doing research to the folding technique which Charles Eames applied to his Plywood experiment in 1946. This way of designing provides the strength, the detail for technique, and an easy manufacturing process. The material that has been used for the stools is mainly composed from recycled PE.