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Sunday, July 20, 2014

Day 328 - SUN Customizable Function Bracelet

Continuing the bracelet series from Day 320 and Day 322, today we printed a new customizable sun-shaped variation. The bracelet is a little bit stretchy but not as much as emmett's classic Stretchlet design.


Thingiverse link: http://www.thingiverse.com/thing:425503

Settings: Printed on a Replicator 2 and a Replicator Mini at .3mm layer height, with raft. Note that no fancy settings are needed because the design is already just an outline of a bracelet.

Technical notes, design upgrade flavor: In a comment to Day 322, kitwallace mentioned a much nicer redesign using ruled surfaces which he described on his blog The Wallace Line. I've got a couple more completed bracelet designs to post and then I'm going to switch to kitwallace's method. Very cool!

Technical notes, math flavor: This bracelet differs from the TRI design on Day 320 in that the trigonometric function has a variable frequency instead of a fixed frequency of 3. Specifically, we are wrapping the function

radius+amplitude*(1+sin(frequency*t)))

around the circle to make these bracelets. The twistiness of the transluscent blue and opaque white bracelets in the picture come from a twist during the OpenSCAD extrude process, not from the mathematical function. However when we upgrade to code based on kitwallace's suggestion above, we will be able to encode the twist - as well as many other transformations - mathematically.