We check this website, now knots3d.com is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is knots3d Down Right Now? - NO! knots3d is up!
If you have problem with access to site knots3d, and domain knots3d.com is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).