Unless I am mistaken, this is NOT a 3D-printed Mac. The outer plastic shell was 3D-printed. But everything else was salvaged or replacement/upgraded parts. If he did print all the non-plastic (metal) parts, he didn't show him doing so in this video. And he didn't show how he printed the plastic parts like the wiring shell, the integrated circuit boards, and buttons, etc. If I'm wrong, please let me know and maybe a timestamp in the video where he shows/talks about these discrepancies I listed.
Impressive that he did all this, but I think it's extremely misleading to title this article "Check Out This Functional 3D Printed Macintosh".