What is the relationship between 3D Systems and 3D printing in the context of the input sentence. Choose an answer from: 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.

Why it's happening: Since competitor 3D Systems reported its second-quarter earnings last Thursday, which didn't offer any major surprises, the 3D printing sector in general has moved higher.

Answer: industry