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

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