Two Versions of a Celtic Knot

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The Celtic Knot is a derivative of another knot, which has a continuous path. To create a closed path, modifications were made, resulting in a seven-crossing knot - see 7 sub 4 on Wikipedia and page 43 of maths.ed.ac.uk/aar/knots/celtic.pdf. The openSCAD code generates version one of this knot: celtic_ver1.stl. D. Moews suggested that a version with smooth curves would be more appealing, so he provided a Fortran program to calculate such a knot; running the code produced celtic_ver2.stl. Version 2 makes an attractive amulet, and both versions include Fortran and openSCAD code. Printer Settings: Brand: MakerBot Printer: MakerBot Replicator (5th Generation) Rafts: Yes Supports: Yes Resolution: 0.2 mm Notes: Version one was designed to print vertically; version two prints well lying flat on the build plate. Both require support, easily removable with tweezers. Note: Although the knot appears symmetrical, it actually lacks symmetry. A mirror image is included for constructing amulet pairs.