20250213 bridge tweaks

Results: Still can't get a good grip on the sleeve nut for the tuner, and the washer is right out. Need to expand that clearance more.
Full assembly note: Tension imbalance in the two strings bows the neck sideways,

CFTubes.scad

@@ -1116,7 +1116,7 @@ COLOURSCHEME_PETGHF_BLUE = [BAMBU_PETGHF_LAKE_BLUE, BAMBU_PETGHF_LAKE_BLUE, "",
 module TwoBangerMk2(include_colours=[0,1], segment=-1, preview=false) {
 	$include_colours = include_colours;
 	$guitar_scale_length_mm = PBass_Scale_mm;
-	$id_lines = ["Zweisaiten", "250213"];
+	$id_lines = ["Zweisaiten", "250213-1"];
 	$fsl_mm = fret_scale_length(0);
 
 	$string_diameters_thous = [80, 105];  // Artist BST45130
@@ -1162,7 +1162,7 @@ module TwoBangerMk2(include_colours=[0,1], segment=-1, preview=false) {
 		// 	mirror([i,0,0]) translate([15, (i*32)-66, -26]) rotate([0, -90, 0]) UBassTuner(from_side=false, from_below=true);
 		// Tuners to the top, knobs pointing out the back
 		for (i=[0:1])
-			mirror([i,0,0]) translate([-3.5, -78, -32]) rotate([0, 0, -90]) UBassTuner(from_side=false, from_below=true);
+			mirror([i,0,0]) translate([-3.5, -78, -32]) rotate([0, 0, -90]) UBassTuner(from_side=false, from_below=true, hole_tolerance=0.5);
 		// rotate([180, -90, 0]) UBassTuner(from_side=false, from_below=true);
 	}
 
@@ -1344,7 +1344,9 @@ module TwoBangerMk2(include_colours=[0,1], segment=-1, preview=false) {
 		color("#FF000080") MyBody();
 		strings_reference(30);
 	} else render() {
-		if (segment < 0) {
+		if (segment == "bridge") {
+			FlatBridge();
+		} else if (segment < 0) {
 			MyBody();
 		} else {
 			difference() {
@@ -1363,7 +1365,7 @@ module TwoBangerMk2(include_colours=[0,1], segment=-1, preview=false) {
 
 colour_scheme = COLOURSCHEME_ABS_BLUE;
 // TwoBangerMk2(preview=true);
-segment = 0;
+segment = "bridge";
 color(colour_scheme[0]) TwoBangerMk2([0], segment);
 color(colour_scheme[1]) TwoBangerMk2([1], segment);
 color(colour_scheme[2]) TwoBangerMk2([2], segment);

CFTubes/common.scad

@@ -213,7 +213,7 @@ module TrussRod(length = 630, tolerance = 0, taper_l = 3.0, taper_extra = 1.0, t
 	];
 	TrussRodGeneric(length=length, tolerance=tolerance, stages=stages, taper_l=taper_l, taper_extra=taper_extra, taper_points=taper_points, extra=extra);
 }
-module TrussRodSingleAction(length = 460, tolerance = 0, taper_l = 1.5, taper_extra = 1.0, taper_points=[], extra=false) {
+module TrussRodSingleAction(length = 460, tolerance = 0, taper_l = 3.0, taper_extra = 1.0, taper_points=[], extra=false) {
 	// base profile
 	base_d = 4.6 + tolerance;
 	base_w = 6.1 + tolerance;

EllipticalNeck.scad

@@ -346,3 +346,38 @@ module TaperNeck(
 		}
 	}
 }
+
+module FlatBridge(saddle_height = 10, base_height = 6, y_len = 15) {
+	// A bridge with no channel notch or piezo strip notch, to be printed more easily for coil-only guitars
+	// Base
+	render() difference() {
+		// Flatten off a rounded cube
+		r = 0.6;
+		translate([-neck_width()/2, 0, -r]) round_cube([neck_width(), y_len, base_height+r], r=r);
+		translate([-neck_width()/2, 0, -r]) cube([neck_width(), y_len, r]);
+		// screw hole just in case
+		translate([0, y_len/2, 0]) cylinder_outer(d=2.25, h=base_height);
+		countersink = 3;
+		translate([0, y_len/2, base_height-countersink]) cylinder_outer(d=5, h=countersink);
+	}
+	// String saddles - rule of thumb: string diameter multiplied by 4
+	// Make the thinnest string sit right at the front
+	m = 4;
+	saddle_y0 = 2.5; //1.2;
+	saddle_y1 = -3.7;
+	r0 = 0.85;
+	y_start = y_len + min($string_diameters_mm)*m - (r0+saddle_y0);
+	for (i = [0:$num_strings-1]) translate([($num_strings-i-1)*string_spacing(0) - neck_width()/2 + $string_margin, y_start - $string_diameters_mm[i]*m, base_height]) {
+		step = ($preview) ? 9 : 3;
+		r1 = r0 + $string_diameters_mm[i]*1.2;
+		r2 = r0 + $string_diameters_mm[i]*1.1;
+		translate([0, 0, saddle_height]) for (a=[90:step:270-step]) hull() {
+			translate([-sin(a)*r1,      0, cos(a)*r2])      sphere(r=r0, $fn=cyl_ld_fn);
+			translate([-sin(a+step)*r1, 0, cos(a+step)*r2]) sphere(r=r0, $fn=cyl_ld_fn);
+			translate([-sin(a)*r1,      saddle_y0, -saddle_height-r0]) sphere(r=r0, $fn=cyl_ld_fn);
+			translate([-sin(a+step)*r1, saddle_y0, -saddle_height-r0]) sphere(r=r0, $fn=cyl_ld_fn);
+			translate([-sin(a)*r1,      saddle_y1, -saddle_height-r0]) sphere(r=r0, $fn=cyl_ld_fn);
+			translate([-sin(a+step)*r1, saddle_y1, -saddle_height-r0]) sphere(r=r0, $fn=cyl_ld_fn);
+		}
+	}
+}

UBassTuner.scad

@@ -1,11 +1,11 @@
 
-module UBassTuner(from_below=false, from_side=true) {
+module UBassTuner(from_below=false, from_side=true, hole_tolerance=0) {
 	t_base = 11;
-	d_thread = 11.0 + 0.25;
+	d_thread = 11.0 + 0.25 + hole_tolerance;
-	d_collar = 13.8 + 0.2;  // Add some tolerance
+	d_collar = 13.8 + 0.2 + hole_tolerance;  // Add some tolerance
 	l_collar = 8;  // doesn't include hex
 	l_collarnut_to_top_of_peg = 19; //22;
-	d_top_of_peg = 16+2;
+	d_top_of_peg = 16+2 + hole_tolerance;
 	max_thread = 5.0;  // thread to cover without the collar
 	w_tag = 19;
 	l_tag = 32.5;
@@ -29,7 +29,7 @@ module UBassTuner(from_below=false, from_side=true) {
 	module tuner_footprint() {
 		hull() {
 			translate([-w_tag/2, -l_tag+d_screw_tab/2]) square([w_tag, l_tag_rect]);
-			circle(d=d_screw_tab, $fn=72);
+			translate([0, 1.0]) circle(d=d_screw_tab, $fn=72);
 		}
 	}
 	module tuner_footprint_extrude(h) {
@@ -37,7 +37,7 @@ module UBassTuner(from_below=false, from_side=true) {
 		// src/openscad/src/geometry/linear_extrude.cc:409: std::unique_ptr<Geometry> extrudePolygon(const LinearExtrudeNode&, const Polygon2d&): Assertion `poly.isSanitized()' failed.
 		hull() {
 			translate([-w_tag/2, -l_tag+d_screw_tab/2, 0]) cube([w_tag, l_tag_rect, h]);
-			cylinder(h=h, d=d_screw_tab, $fn=72);
+			translate([0, 0.75, 0]) cylinder(h=h, d=d_screw_tab, $fn=72);
 		}
 	}
 	module holes() {