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module prism(l, w, h) {
polyhedron(
points=[
[0,0,h], // 0 front top corner
[0,0,0], [w,0,0], // 1, 2 front left & right bottom corners
[0,l,h], // 3 back top corner
[0,l,0], [w,l,0] // 4, 5 back left & right bottom corners
],
faces=[ // points for all faces must be ordered clockwise when looking in
[0,2,1], // top face
[3,4,5], // base face
[0,1,4,3], // h face
[1,2,5,4], // w face
[0,3,5,2], // hypotenuse face
]
);
}
module reflect(axises) {
children();
mirror(axises) children();
}
baseThickness = 3;
baseHeight = 20;
baseWidth = 80;
gapWidth = 30;
clampDepth = 15;
clampHeight = 5;
threadDiameter = 6.5;
threadTubeOuterDiameter = threadDiameter+baseThickness*2;
difference() {
union() {
cube([baseThickness, baseWidth, baseHeight]);
translate([-clampDepth, 0, 0])
cube([clampDepth, baseWidth, baseThickness+clampHeight]);
translate([baseThickness, baseWidth/2, 0])
reflect([0, 1, 0])
rotate([90, 0, 0])
prism(baseHeight, threadTubeOuterDiameter-baseThickness, baseWidth/2);
translate([threadTubeOuterDiameter/2, baseWidth/2, 0])
cylinder(r = threadTubeOuterDiameter/2, h = baseHeight);
}
// thread hole
translate([threadTubeOuterDiameter/2, baseWidth/2, 0])
cylinder(r = threadDiameter/2, h = baseHeight);
// clamp gap
translate([-clampDepth, (baseWidth-gapWidth)/2, 0])
cube([clampDepth, gapWidth, clampHeight+baseThickness]);
// clamp indent
translate([-clampDepth/2, 0, clampDepth/2+baseThickness])
rotate([-90, 0, 0])
cylinder(r = clampDepth/2, h = baseWidth);
}
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