One CC IPGP mentioned they don't do much with 3-D. However, a privately held company called Optomec expressely uses IPG, mentioning the advantages of their high powered fiber laser. Optomec has partnered with SSYS in the past, and I wouldn't be surprised if SSYS acquired them. That said, not sure if this would really move the needle on IPGP earnings for the foreseeable future, since I don't know what Optomec's growth is like.
Common 3D printing involves laying down thin layers of polymer gels and curing then with UV light, no lasers involved.
Some high end 3D systems use "sintering", that is a layer of metallic or other powders which are heated in selected areas to convert to a solid metal. The process is repeated in thin layers, gradually building the shape. IPGP does make lasers used for sintering but I don't know if their product is in a 3D machine.