A-DNA, B-DNA, Z-DNA
thingiverse
Those are models of DNA double helix represented by 3 classical geometries: A-, B- and Z. Each is 24 base pairs long. More details can be found here https://en.wikipedia.org/wiki/Nucleic_acid_double_helix#Helix_geometries Models are done for educational use. It allows direct comparison of differences between different geometries and their parameters. They were created using 3DNA 2.0 http://web.x3dna.org/index.php/fibermodel, processed in UCSF ChimeraX (https://www.rbvi.ucsf.edu/chimerax/), Fusion360 and smoothed in Blender.
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