Printable Programming

Instructors Krishnan Suresh Associate Professor Mechanical Engineering UW Madison Victor Markus Undergraduate Student (senior) Mechanical Engineering UW Madison Jimmy Herman Undergraduate Student (senior) Mechanical Engineering UW Madison

3D-Printing Why is it a Big Deal?

Geometric Complexity is Free 1. Any shape!

Wide Capacity 2. ‘Any’ size

Democratization 3. Anyone

Where is the catch? - Isthmus News on 3D Printing (Oct, 2015)

Barrier How do we start designing for 3D printing?

Plenty of CAD Tools Expensive Difficult

CADjs (Developed at UW) Press F5 to run the program

Your First Program! 1.Create blocks & cylinders 2.Move to correct location 3.Add and subtract!

Your First Program! base = cube(1,1,1); cyl = cylinder(0.1,1.5); cyl = cyl.translateX(0.2); finalBody = base.difference(cyl); Primitives Transformations Booleans finalBody.display(); (Run Code) base.display(); (F5 to run code)

Challenge Primitives? Transformations? Booleans?

CADjs Language

GUI Operations Save the CADjs Code Load the saved CADjs Code Clear the screen Execute the code (instead of F5) If browser crashes/closed, recover last code Size of the model, number of triangles, etc Save the STL code for 3d-printing 3D printing specific Turn off/on the axis Increase/decrease smoothness Load an STL model

Example

Subtraction g1=cube(1);Parent Material g2=sphere(.6);Subtracting Material g3=g1.difference(g2);Command g1-g2 g3.display();Display

Addition g1=cube(1);Parent Material g2=sphere(.6);Adding Material g3=g1.union(g2);Command g1+g2 g3.display();Display

Intersection g1=cube(1);Parent Material g2=sphere(.6);Intersecting Material g3=g1.intersection(g2);Command g1 interest g2 g3.display();Display

Question 3 solids? Boolean operations?

Solution g1 = cube(1); g2 = sphere(0.6); g3 = cylinder(0.4,2); g4 = g1.union(g2).difference(g3); g4.display(); g4 = g1. difference(g3).union(g2); 3 + (4*5) ≠ (3+4)*5

3D Printing

Scale Model g4.scale(10); g1 = cube(1); g2 = sphere(0.6); g3 = cylinder(0.4,2); g4 = g1.union(g2).difference(g3); g4.display(); Millimeters

Save.stl file g1 = cube(1); g2 = sphere(0.6); g3 = cylinder(0.4,2); g4 = g1.union(g2).difference(g3); g4.scale(10); g4.display();

.stl file

Read STL file into 3D Printer Software Every 3D printer comes with software to read.stl file

Import.stl file XYZware window- import *.stl file

Load model

Resize to fit printer

View Your Model A.view B.rotate C.rotate D.scale

Print

Personalized Key Chain g1 = textGeom('CADjs'); g1 = g1.rotateZ(180).translate(50,10,0); g2 = cube(120,60,5); g3 = g1.union(g2); g3.display();

Questions/Help