Escher knots
Description
Several versions of the large tube knot from the Escher woodcut [Knots](https://www.escherinhetpaleis.nl/story-of-escher/perpetuum-mobile/?lang=en). I think this looks closer to the artwork than my [previous thing](https://www.thingiverse.com/thing:3210463), but unfortunately I couldn't get it to print cleanly. The top looks fine, but the bottom is a mess. I think someone might have better results on an SLA printer? UPDATE: 12/04/2018 I tried reprinting the solid knot with one flat side against the print bed and the remainder held up by supports, and that works much better. I have updated the STLs with models that are rotated, but otherwise the same as before. I've included both a solid-tube version and a hollow-tube version. You'll need to mirror the STL to get it to match the handedness of the original artwork. Other trefoil knots depicted: [Escher trefoil knot (cruciform)](https://www.thingiverse.com/thing:930066) by sombetzki [3 Knot](https://www.thingiverse.com/thing:160478) by eduardoviruena
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