DNA Ring

thingiverse

An attempt at a shape-accurate DNA model, curved around on itself into a ring (5 helical turns for the earring, 12 for the bracelet and 6 for the spinning top). Based on an extruded double helix generated using this script: http://www.thingiverse.com/thing:186660 Instructions I printed an older version of this model (shown in the picture) with a circular raft underneath, but it printed so well that I suspect it will work fine without any support. A customisation script is also provided, which uses the path extrusion script that I previously wrote (see description). My inspiration was from here: http://www.shapeways.com/model/895917/dna-bracelet.html?li=related-items-int&materialId=23 But I have modified the appearance to be more consistent with "true" DNA. In particular: 10 bases per helix turn major / minor groove helical radius 1/3.3 * helix turn arc length pentagonal extrusion (for ribose sugar backbone) base pair joins perpendicular to helix direction Additional things in the other model that were (possibly accidentally) already correct: right-handed turn See here for more details: https://en.wikipedia.org/wiki/Nucleic_acid_double_helix#Helix_geometries