Cutting Edge
Noun and の adjective
さいしんえい
かつて、少し前までは、3Dプリンタは最新鋭の機械でした。
Once, a little while ago, 3D printers were cutting edge machines.
最新 is, as you can probably guess, "the newest." So, the newest sharp thing, is the cutting edge. It is state of the art.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.