Utilize the input text as a context reference, choose the right relationship between Stratasys and 3D printing from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

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

Answer: product_or_material_produced