This knot was created by exporting a model from KnotPlot and then adding extrusions to each mesh face in TopMod, then printed with an Ultimaker 3 using dissolvable PVA supports (the second picture shows the newly-printed knot in a bucket being filled with water).
Inspiration and KnotPlot model are credited by my student Jonathan Gerhard; you can read about his related project on his blog Mathematical ADD here: The Perko Praxinoscope and the Shrikhande Graph.
For information about how this model was designed and 3D printed in PLA with dissolvable PVA supports, see our article at Hacktastic: Giant Spiky Perko Knot.
UPDATE: Follow along with a reprint of this model in PLA with breakaway supports at our new article at Hacktastic: Perko Knot Reprint: Dissolvable vs. Breakaway Supports.
You can buy a much smaller version of this knot in our Shapeways shop:
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