Avoid bad actors impersonating you and give customers a very high degree of confidence that your products are genuine. An instructional video can be viewed here - https://www.youtube.com/watch?v=r2c4eWKOeS4&feature=youtu.be
Verifying your key automatically is clearly out of the question for this community but if you send me a pm on bitcointalk.org with the sha256 of your extended PUBLIC key then I would be happy to verify your account manually.
All questions and comments are welcome :)
More detailed info can be found on the bitcointalk announcement page - https://bitcointalk.org/index.php?topic=1059474.msg11363510#msg11363510
What does 3D printing have to do with /r/DNM's?