Refer to the input text as context and select the correct relationship between 'Stratasys' and '3D printing' from the available options.
Options: headquarters location, product/material produced, brand, location of formation

“We needed to look beyond our factory walls to get a more complete sense of where 3D printing is headed, so we turned to those who live and breathe the technology just like we do – professional users,” said Joe Allison, CEO of Stratasys Direct Manufacturing.
product/material produced