Come on, it was very easy to reverse this before. 3D printing has nothing to do with this. You could also just as easily carve this by hand. P.S: What is this

Come on, it was very easy to reverse this before. 3D printing has nothing to do with this. You could also just as easily carve this by hand. P.S: What is this, the '80s? why is "3-D" hyphenated?