More is surely better, though, right? With that in mind, [Emily The Engineer] set out to make a third arm for popular YouTuber [This Old Tony], and our primary question is this: is it actually useful?

[How To Mechatronics] capitalized on this and built a SCARA robot arm using 3D-printed parts and common 3D-printer components. The basic SCARA mechanism is a two-link arm, similar to a human arm.