This was a fascinating related site which teaches you how to draw them for yourself.
I would like to create a nice endless knot lamp to print on a 3D printer.
Using JF obj importer plugin for SketchUp did not allow me to import the 3D file, but I was able to open the OBJ into Deep Exploration and export as .skp file.
Which opened perfectly into SketchUp. I know there are other obj importer plugins for SU I was just too lazy to install them.
Then inside of SketchUp:
I used Artisan to subdivide and smooth the geometry. (could have used one or two more subdivides
)Painted the object a color of red (or red and yellow).
Used the Twilight Material Editor Template > Blurry Metal
Then I inserted the Twilight Lighting Photo Studio from the Twilight Components pack.
I turned off the sun light, and set sky to Sky Probe and used the apartment probe from this thread or this thread to light the scene.
I set exposure to .5 or .6 in the camera tab, and adjusted the gamma to .9 or something.
Render on Easy 09.
In the second knot, I discovered the 3D geometry options in the program, so eliminated the need for Artisan for subdividing/smoothing.