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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
]);
}
threadDiameter = 7;
threadTubeOuterDiameter = 11;
baseThickness = 4;
baseHeight = 40;
baseWidth = 80;
gapWidth = 30;
clampDepth = 15;
clampHeight = 10;
difference() {
union() {
cube([baseThickness, baseWidth, baseHeight]);
translate([-clampDepth, 0, 0])
prism(baseWidth, clampDepth+baseThickness, clampHeight);
translate([0, (baseWidth - threadTubeOuterDiameter)/2, 0])
cube([threadTubeOuterDiameter, threadTubeOuterDiameter, 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]);
}
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