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.

27, 2015-- Stratasys Ltd. (Nasdaq:SSYS), aleading global provider of 3D printing and additive manufacturing solutions, will participate in the Prosthetics and Assistive Technology Challenge , a two-day event hosted by the VA Assistive Technology Program and VA Center for Innovation, July 28-29 in Richmond, Virginia at the Hunter Holmes McGuire VA Medical Center .

Answer: product_or_material_produced