Refer to the input text as context and select the correct relationship between 'Stratasys' and '3D printing' from the available options.
Options: chairperson, product/material produced, position held, operator

Following the longstanding success of using Stratasys PolyJet and FDM 3D printing for prototyping applications, the company now deploys its Fortus 3D Production Systems to expand its direct manufacturing services to customers.
product/material produced