This is a model of the woodcut picture made by M.C. Escher in 1965 called 'Knots".
It has since then been a challenge for 3d modelers and mathematicians.
As far as I know it has not been modeled in 3d up till now. (It has! see comments).
The model's height is about 8 cm.
4.114 w x
7.856 d x
1.62 w x
3.093 d x