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.

That's because when fellow 3D printing bigwig Stratasys reported its quarterly results last week, it withdrew its full-year 2015 guidance, citing lack of visibility into customer demand, and issued a third-quarter outlook that fell significantly short of what analysts were forecasting.

Answer: product_or_material_produced