We check this website, now 3dsystems.com is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is 3dsystems Down Right Now? - NO! 3dsystems is up!
If you have problem with access to site 3dsystems, and domain 3dsystems.com is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).