November 15, 2012 AT 1:00 am

Automated Cookie Cutters: OpenSCAD surface() Function #3dthursday

CutterAndHeightMap

Ed Nisley has been taking a look at a less-frequently used tool in OpenSCAD to help him generate automated cookie cutters from image files. Take a look at where he started and then trace his progress into “Height Map Image File Preparation“, “Creating the Height Map Data File“, and finally “Putting It All Together“.

From his initial post on the subject:

While pondering the notion of making cookie cutters, it occurred to me that the process could be automated: a grayscale height map image of the cookie should be enough to define the geometry. The existing height map solutions (like William Adams’s fine work) seem entirely too heavyweight, what with custom Windows or Java programs and suchlike. Some doodling indicates that a simpler solution may suffice for my simple needs, although the devil always hides in the details.

The overall problem with a cookie press involves producing a non-rectangular solid with a bumpy upper surface corresponding to the grayscale values of an image: dark pixels = low points of the surface, light pixels = peaks. The image size controls the XY extent of the solid and the pixel values control the Z, with some known value (likely either black or white) acting as a mask around the perimeter. Given such a solid, you can then wrap a cutter blade and handle around the outline, much as I did for the Tux cutter.

OpenSCAD has a lightly documented surface() function that reads an ASCII text file consisting of an array of numeric values…

Read More.


649-1
Every Thursday is #3dthursday here at Adafruit! The DIY 3D printing community has thrilled us at Adafruit with its passion and dedication to making solid objects from digital models. Recently, we have noticed that our community integrating electronics projects into 3D printed enclosures, brackets, and sculptures, so each Thursday we celebrate and highlight these bold pioneers!

Have you take considered building a 3D project around an Arduino or other microcontroller? How about printing a bracket to mount your Raspberry Pi to the back of your HD monitor? And don’t forget the countless EL Wire and LED projects that are possible when you are modeling your projects!

The Adafruit Learning System has dozens of great tools to get you well on your way to creating incredible works of engineering, interactive art, and design with your 3D printer! If you have a cool project you’ve made that joins the traditions of 3D printing and electronics, be sure to send it in to be featured here!


“D is for Diode” – Circuit Playground Episode 4 is out now! CLICK HERE TO WATCH!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground”Adafruit’s Apps!



No Comments

No comments yet.

Sorry, the comment form is closed at this time.