Today the holiday visits are over and we are back to designing. Something simple to start, and to get ahead for the next holiday: customizable easy-to-print broken hearts that you can string together. More importantly, this model is also a tutorial for printing designs based on mathematical parametric functions in OpenSCAD.
STL file: http://www.geekhaus.com/makerhome/day133_brokenhearts.stl
Thingiverse Customizer link: http://www.thingiverse.com/thing:220720Settings: MakerWare .3mm/low in almost no time at all. The top indentation of each heart has a gap so that you can chain the hearts together.
Technical notes: This model was made in OpenSCAD using the following parametric equations that define a heart shape (equations obtained from Wolfram’s HeartCurve page):
x = 16 sin^3 t
y = 13 cos t - 5 cos 2t - 2 cos 3t - cos 4t
/////////////////////////////////////////////////////////////
// EXTENSIONS ///////////////////////////////////////////////
// curriculum.makerbot.com/daily_tutorial/openscad/openscad_05.html
// include <EXTENSIONS/2dgraph.scad>
/////////////////////////////////////////////////////////////
// PARAMETERS ///////////////////////////////////////////////
// Set the diameter of the heart, in mm
heart_diameter = 20;
// Set the thickness of the line, in mm
line_thickness = 1;
// Set the height of the model, in mm
line_height = 3;
// Choose low numbers for jagged, high for smooth
number_of_steps = 48;
scalefactor = heart_diameter*1.15/20;
/////////////////////////////////////////////////////////////
// RENDERS //////////////////////////////////////////////////
// broken heart parametric curve
// equation from http://mathworld.wolfram.com/HeartCurve.html
function x(t) = scalefactor*16*pow(sin(t),3);
function y(t) = scalefactor*(13*cos(t)-5*cos(2*t)-2*cos(3*t)-cos(4*t));
// make the graph and extrude it
linear_extrude(height=line_height)
2dgraph( [0, 350], // stop before 360 to make broken
line_thickness, // set line thickness
steps=number_of_steps, // choose low/high poly look
parametric=true); // use parametric grapher
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