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3D scanning and printing (Feb 20)

Assignment
   * 3D scan an object
      - extra credit: make the scanner
   * design and 3D print an object (small, few cm)
      - extra credit: edit and print an object that you scanned

3D scan an object

This week the class has divided into several working groups to learn different 3d scanning techniques. There were several options to scan an object: laserScanner,123DCatch,structured light with a projector, milk scanner. Juan and me started with Autodesk 123d Catch, this is a program that uses some photos, minimum 30, to create a 3D model.

We conducted a first test, without any strategy to take photos. The aim was to verify the results with a minimum of required photos

Photos

Autodesk 123D catch

We obtained amazing results, the program was able to generate a model very close to reality with the minimum of photos we take.

The second test we tried to find an object more complicated and take more photos.

Photos

In this case, the results were not successful. The program did not detect patterns of fusion photos and asked us to create a common reference points.

After introducing several benchmarks, the result did not find it acceptable to print in 3D. This video shows the result obtained

This experience showed me that it's advisable to place the object in a background with clear references to facilitate the work of the program, points and lines in a white background with good light, for example. It is advisable to plan your shots

Planning your shoot

Design and 3D print an object

I have designed a wheel for my final project, can be directly coupled to the motor that I chose.

I have selected the the Makerbot to print my first test. I need to save a .STL file and install the Makerware to convert this format on Makerbot format. It is very important to place the object above the axis 0, so that the machine will not be damaged.

Once printed, I realized the terrible mistake he had created in the part design. At the top of the wheel, I did not create a base that support the material protruding.

I should be careful with this in future designs