DNA Sculpture (Parameterised)
by cathalgarvey, published
A fairly simple sculpture of DNA, built on a stand so you can use it as a nerdy desk ornament or as a teaching aid. Or as an aspirational goal, if you're anything like me ("I will best you yet, DNA!")
The Makerbot-printed versions are not technically correct, but all told, it's a modestly accurate representation, although the real thing is more dense and complex. And constantly under assault/revision by proteins and nosy scientists. I've included a version of the molecule which roughly corresponds to the common, active form in cells, called "B-DNA".
If you've only ever seen those pictures of DNA that look like a ladder twisted along its virtual axis, welcome to the slightly quirkier reality! If you like this kinda stuff, check out DIYbio.org. If you live on the West Coast and want a Bio-Hackerspace to play in, support "Biocurious" on Kickstarter!
I have put this model on Shapeways for those who might want a premium model in acrylic, glass, steel or plated gold!
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In the definition of OvoidBase I changed:
sphere(r = BaseLength/2);
rotate([90,0,0]) cylinder(r = BaseLength/2, h=BaseLength-2, center=true);
so it still does get flattened somewhat by the surrounding scale command. I put the -2 in the height and I also bumped BackboneRadius to 5.2 to make the seam between the base and the backbone smoother.
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There is a third model representing "B-DNA" as accurately as I was willing to spend time on. :)
There's a fair amount of cleanup to do, thanks to the first layer or two of each base pair being dropped into thin air. Better skeinforging might lead to better models. A firmly supported build platform would help too, which I lacked in printing mine.
Note: The OpenSCAD file contains support for cuboidal bases and ovoid backbones, as well as options to vary the spacing between strands and their relative rotation from one another. And how twisty they are. And how densely to pack in the bases. Basically the works, it's OpenSCAD after all.
IMPORTANT: After you have printed, remember to post under "I made one!" on Thingiverse. If you don't, you'll develop nasty boils and members of whatever gender you are into will shun you.
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