From 101fb5b6d1a7baf748ad8452fb032dcf2c413dd8 Mon Sep 17 00:00:00 2001
From: Luke Hubmayer-Werner <mongoose41@gmail.com>
Date: Sat, 1 Feb 2025 18:22:58 +1030
Subject: [PATCH] First attempt at truss rod model

---
 CFTubes.scad        | 19 +++++++++++----
 CFTubes/common.scad | 56 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 5 deletions(-)

diff --git a/CFTubes.scad b/CFTubes.scad
index 51c85f6..542a3ee 100644
--- a/CFTubes.scad
+++ b/CFTubes.scad
@@ -667,8 +667,17 @@ COLOURSCHEME_ABS_BLUE = [BAMBU_ABS_NAVY_BLUE, BAMBU_ABS_AZURE, BAMBU_ABS_AZURE,
 COLOURSCHEME_PETGHF_BLUE = [BAMBU_PETGHF_LAKE_BLUE, BAMBU_PETGHF_LAKE_BLUE, "", ""];
 
 // colour_scheme = COLOURSCHEME_ABSGF_CLOWNFISH;
-colour_scheme = COLOURSCHEME_ABS_BLUE;
-color(colour_scheme[0]) Nylon6String(from_fret=0, to_fret=22, render_colour_0=true, render_colour_1=false, render_colour_2=false, render_colour_3=false);
-color(colour_scheme[1]) Nylon6String(from_fret=0, to_fret=22, render_colour_0=false, render_colour_1=true, render_colour_2=false, render_colour_3=false);
-color(colour_scheme[2]) Nylon6String(from_fret=0, to_fret=22, render_colour_0=false, render_colour_1=false, render_colour_2=true, render_colour_3=false);
-color(colour_scheme[3]) Nylon6String(from_fret=0, to_fret=22, render_colour_0=false, render_colour_1=false, render_colour_2=false, render_colour_3=true);
+// colour_scheme = COLOURSCHEME_ABS_BLUE;
+// color(colour_scheme[0]) Nylon6String(from_fret=0, to_fret=22, render_colour_0=true, render_colour_1=false, render_colour_2=false, render_colour_3=false);
+// color(colour_scheme[1]) Nylon6String(from_fret=0, to_fret=22, render_colour_0=false, render_colour_1=true, render_colour_2=false, render_colour_3=false);
+// color(colour_scheme[2]) Nylon6String(from_fret=0, to_fret=22, render_colour_0=false, render_colour_1=false, render_colour_2=true, render_colour_3=false);
+// color(colour_scheme[3]) Nylon6String(from_fret=0, to_fret=22, render_colour_0=false, render_colour_1=false, render_colour_2=false, render_colour_3=true);
+
+// TrussRod();
+difference() {
+	l = 70;
+	w = 20;
+	extra = 5;
+	translate([-w/2, -extra, 1.6-w/2]) cube([w, l+extra, w]);
+	TrussRod(taper_points=[-extra, l], extra=true, tolerance = 0.24);
+}
diff --git a/CFTubes/common.scad b/CFTubes/common.scad
index 0adff81..faf5d2a 100644
--- a/CFTubes/common.scad
+++ b/CFTubes/common.scad
@@ -146,3 +146,59 @@ module CFSquareCutout2(v, block_y0, block_y1, tolerance = CF_Square_Width_tolera
 	// 	}
 	// }
 }
+
+module TrussRod(length = 630, tolerance = 0, taper_l = 1.5, taper_extra = 1.0, taper_points=[], extra=false) {
+	$fn = 360;
+	epsilon = 0.00000001;
+	rot = [-90, 180, 0];
+
+	module squircle(d, h, w) {
+		render() hull() {
+			circle(d = d);
+			translate([-w/2, h - d/2 - epsilon]) square([w, epsilon]);
+		}
+	}
+	// base profile
+	base_d = 6.0 + tolerance;
+	base_w = base_d;
+	base_h = 9.0 + tolerance;
+
+	// nut?
+	stage2_d = 7.0 + tolerance;
+	stage2_w = base_w;
+	stage2_h = base_h + (stage2_d - base_d);
+	stage2_l = 55 + tolerance;
+
+	// Turning end
+	stage3_d = 9.1 + tolerance;
+	stage3_w = stage3_d;
+	stage3_h = base_h + (stage3_d - base_d);
+	stage3_l = 35 + tolerance;
+
+	// Rod outline
+	stages = [  // Must be ascending order for later
+		[stage3_l, stage3_d, stage3_h, stage3_w],
+		[stage2_l, stage2_d, stage2_h, base_w],
+		[length, base_d, base_h, base_w],
+	];
+	for (s = stages) rotate(rot) linear_extrude(s[0]) squircle(s[1], s[2], s[3]);
+	if (extra) {
+		l = 33;
+		s = stages[0];
+		translate([0, -l, 0]) rotate(rot) linear_extrude(l+s[0]) squircle(s[1], s[2], s[3]);
+	}
+
+	// Tapers
+	for (x = taper_points) {
+		larger_stages = [ for (s = stages) if (s[0] >= x) s];
+		if (len(larger_stages)) {
+			s = larger_stages[0];
+			t2 = taper_extra * 2;
+			render() hull() {
+				translate([0, x-epsilon/2, 0]) rotate(rot) linear_extrude(epsilon) squircle(s[1]+t2, s[2]+t2, s[3]+t2);
+				translate([0, x+taper_l-epsilon, 0]) rotate(rot) linear_extrude(epsilon) squircle(s[1], s[2], s[3]);
+				translate([0, x-taper_l, 0]) rotate(rot) linear_extrude(epsilon) squircle(s[1], s[2], s[3]);
+			}
+		}
+	}
+}