The only tricky part was picking up the model, since it is made of shells that kind of slide around when you try to grab them all together. So today I made a base for the model and stamped it with the name of our Taalman/Kohn Calculus book so that the publisher can give these models away to people who are using the book. This model is an eight-shell approximation of the volume described Exercise #29 in Section 6.2 (or Section 9.2 if you're using the Calculus I with Integrated Precalculus version): the solid of revolution defined by rotating the region between f(x)=4-x^2 and the x-axis on [0,2] around the y-axis.
Thingiverse link: http://www.thingiverse.com/thing:305282
Settings: Printed on a MakerBot Replicator 2 with .3mm/low.
Technical notes, OpenSCAD flavor: This model is really simple, so a good example if you're new to OpenSCAD. It uses the write.scad code which is included with this command:
use <write.scad>
If the file is in a separate directory then you'll also need to include the path to the file. The code is simple, just make two circles with holes cut out to hold the model, remove a bar through the intersection for the text to pass through, and add the text.
// name base for the first-example models
difference(){
union(){
// left holder
difference(){
color("white") cylinder(h=4,r=30);
translate([0,0,1.2]) cylinder(h=3,r=26);
}
// right holder
difference(){
translate([0,56,0]) color("white") cylinder(h=4,r=30);
translate([0,56,0]) translate([0,0,1.2]) cylinder(h=3,r=26);
}
}
// box to clip out center
translate([0,30,6.2])
cube([17,30,10],center=true);
// names
translate([0,28.5,3.6]) rotate(90,[0,0,1])
color("blue") write("TAALMAN/KOHN",t=6,h=12.5,center=true);
}
