Analyze the relationship between 'Stratasys' and '3D printing' within the context of the input sentence.
Options: industry, director/manager, product/material produced, parent organization

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
industry