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// This implements the basic shape for the vertex.
//
// DO NOT SLICE THIS.
//
// This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
// International License.
// Visit: http://creativecommons.org/licenses/by-sa/4.0/
//
// Haydn Huntley
// haydn.huntley@gmail.com
include <configuration.scad>;
extraClearance = 0.3;
grooveRadius = 0.7;
crossPieceOffset = -43;
layerHeight = 0.2;
function fnX(d, offset=0) = d * sin(30) - offset;
function fnY(d, offset=0) = d * cos(30) - offset;
module vertex(height)
{
// This draws the core shape used at the three corners with the given
// height.
difference()
{
hull()
{
// The circular section at the vertex.
translate([0, -12, 0])
scale([1, 1, 1])
cylinder(r=30.8, h=height, $fn=360/2);
// The triangular section for the arms.
for (a = [1, -1])
translate([a*20, -5, 0])
rotate([0, 0, a*30])
translate([-extrusionWidth/2, -3.5*extrusionWidth, 0])
cube([extrusionWidth, 3.5*extrusionWidth, height]);
}
// Remove space for the vertical 2020 extrusion.
rotate([0, 0, 45])
translate([-(extrusionWidth+extraClearance)/2,
-(extrusionWidth+extraClearance)/2, -smidge/2])
cube([extrusionWidth+extraClearance,
extrusionWidth+extraClearance, height+smidge]);
// At the bottoms of the vertical 2020 extrusions, widen out the
// square hole slightly to account for the first layer squishing
// inward.
for (i = [0:4])
{
size = extrusionWidth+extraClearance+(4-i)*nozzleWidth/3;
rotate([0, 0, 45])
translate([-size/2,
-size/2,
i*layerHeight-smidge/2])
cube([size, size, layerHeight+smidge]);
}
// Remove four vertical grooves to make the inside corners sharp.
for (a = [1:4])
rotate([0, 0, 45+a*90])
translate([extrusionWidth/2, extrusionWidth/2, -smidge/2])
cylinder(r=grooveRadius, h=height+smidge, $fn=8);
// Remove space for the horizontal 2020 extrusions.
for (a = [1, -1])
translate([a*20, -5, 0])
rotate([0, 0, a*30])
translate([-(extrusionWidth+smidge)/2,
-2-2-4*extrusionWidth-smidge/2,
-smidge/2])
cube([extrusionWidth+smidge,
2+4*extrusionWidth+smidge,
height+smidge]);
// Remove interior space for the pulleys.
hull()
for (x = [1, -1])
for (d = [23, 41.2])
translate([x*fnX(d, 3.5), -fnY(d, -4), -smidge/2])
cylinder(r=5, h=height+smidge, $fn=24);
// Remove exterior space for the motor.
hull()
for (x = [1, -1])
for (d = [57, 100])
translate([x*fnX(d, 3.5), -fnY(d, -4), -smidge/2])
cylinder(r=5, h=height+smidge, $fn=24);
// Remove two vertical grooves to make the inside corners sharp.
for (a = [1, -1])
translate([a*20, -5, 0])
rotate([0, 0, a*30])
translate([-a*extrusionWidth/2, -2, -smidge/2])
cylinder(r=grooveRadius, h=height+smidge, $fn=8);
}
// Add pads at the ends of the arms.
color("green")
for (x = [1, -1])
translate([x*fnX(82, -2), -fnY(82), 0])
cylinder(r=10, h=0.4, $fn=24);
}
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