Utilize the input text as a context reference, choose the right relationship between 'Stratasys' and '3D printing' from the options.
Options: product/material produced, member of, employer, founded by

"We believe our industry is transitioning through a period of slower growth, as users digest their investments in 3D printing and expand the utilization of recently acquired capacity," Stratasys CEO David Reis said in a statement.
product/material produced