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Let’s take a moment to appreciate all the time and thought Matthew Petroff put into this mouthwatering bit of yum!
The zeroth iteration of the fractal, a square, forms the first layer of the cookie, while the first three iterations of the fractal form three additional layers, for four cookie layers in total.
Read more and get the cookie cutters
A new guide today in the Adafruit Learning System: DIY Desktop Calculator with CircuitPython by Jeff Epler.
In this project, you’ll build your own Desktop Calculator with CircuitPython. Along the way you’ll also learn about the alternative “RPN” notation for calculating, how a keyboard matrix works (and how to create your own!), and more!
What a really neat project.
via megardi on instructables
An encoder converts information from one format or code to another. The device presented in this Instructable will convert the decimal numbers 0 through 9 into their binary equivalents. However, the concepts presented here can be used to create encoders for any reasonable number of items and codes (say 20 or less). Aside from a few easily obtained microswitches and screws, all of the parts for this mostly mechanical machine can be 3D printed.
Via J. Peterson’s blog – Apple’s recently introduced Mac Pro features a distinctive pattern of holes on the front grill… that pattern is very appealing, and re-creating it is a fun exercise.
The best clue about the pattern comes from this page pitching the product. About halfway down, by the heading “More air than metal” is a short video clip showing how the hemispherical holes are milled to create the pattern.
With a bit of trig, you can find half the horizontal spacing x by using the right triangle formed by that line, x and the side of the equilateral triangle. The angle from the vertical center line to the equilateral triangle edge is half of π/3, π/6. So, x=2r tan(π/6) and 2x is the horizontal spacing of the circles.
The blog goes on to use trigonometry to calculate the opposite hole positioning and with some pixel counting, some thickness estimates.
So to CAD this up, all you need to do is start with a rectangular block of thickness t, and use the formulas above to place the centers of the spheres (with diameter 2r) on the front and back of the block.
If you just want to quickly print or look at the result in 3D, there are some sample STL files posted on Thingiverse.
Peckish this weekend? Perhaps Matthew Petroff’s recent creation is to your liking?
Three years ago, I entered an Ashley Book of Knots Cake into the Johns Hopkins University Sheridan Libraries’ third annual Edible Book Festival. For this year’s contest, I figured I could apply my 3D-printed Hilbert curve microwave absorber research to craft a cake for Hans Sagan’s Space-Filling Curves book on the eponymous topic. Thus began an endeavor involving thermoplastic, silicone, and sugar.
Next comes a dizzying amount of work with 3D printing, reverse mold making and the like:
While I had hoped that the two-part plastic mold would allow the silicone mold to be easily removed once it had cured, this was an incredibly naive notion. After all attempts to carefully disassemble the plastic mold and remove the cured silicone failed, I ended up smashing the plastic mold to bits in order to free the silicone mold.
Read the whole story on how to make the cake and Matthew’s success on the blog here.
