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

MakerBot's performance Over the last two quarters, MakerBot's performance has become a sensitive subject for Stratasys because the consumer 3D printing unit's revenue growth rate has fallen off a cliff since the third quarter of last year: Source: Stratasys
product/material produced