Take context from the input text and decide on the accurate relationship between 'Stratasys' and '3D printing' from the options provided.
Options: product/material produced, member of, distribution format, distributed by

Troy Jensen at Piper Jaffray said that the 3D printing industry is "starting to show signs of reacceleration," with the outlook for Stratasys being more positive than that for 3D Systems.
product/material produced