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// Calibration test tower
//
// Generate STL using OpenSCAD:
// openscad square_tower.scad -o square_tower.stl
square_width = 5;
square_size = 60;
square_height = 50;
antiwarp_height = .8;
antiwarp_radius = 5;
CUT = 0.01;
module notch(x, y, rot) {
depth = .5;
width = 1;
translate([x, y, 0])
rotate([0, 0, rot])
translate([-depth, -width, -CUT])
cube([2*depth, 2*width, square_height + 2*CUT]);
}
module square_with_notches() {
difference() {
// Start with initial square
cube([square_size, square_size, square_height]);
// Remove four notches on inside perimeter
notch(square_width, square_size/2 - 4, 0);
notch(square_size - square_width, square_size/2, 0);
notch(square_size/2, square_width, 90);
notch(square_size/2, square_size - square_width, 90);
}
}
module anti_warp_feet() {
module anti_warp_cylinder() {
cylinder(r=antiwarp_radius, h=antiwarp_height, $fs=.5);
}
dist = antiwarp_radius / 2.5;
translate([dist, dist, 0])
anti_warp_cylinder();
translate([square_size-dist, dist, 0])
anti_warp_cylinder();
translate([dist, square_size-dist, 0])
anti_warp_cylinder();
translate([square_size-dist, square_size-dist, 0])
anti_warp_cylinder();
}
module hollow_square() {
difference() {
union() {
square_with_notches();
anti_warp_feet();
}
translate([square_width, square_width, -CUT])
cube([square_size-2*square_width, square_size-2*square_width,
square_height + 2*CUT]);
}
}
hollow_square();
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