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.

3D printing company 3D Systems (NYSE:DDD) replaced its CFO Friday, just six months after hiring him, sending its stock to a three-year low.

Answer: industry