Trimmed the ribbon clamp tape.

Added check for radius too big for corner in rounded_path().
Spiral paths can now have 0 twists.

CHANGELOG.md

@@ -3,6 +3,13 @@
 This changelog is generated by `changelog.py` using manually added semantic version tags to classify commits as breaking changes, additions or fixes.
 
 
+### [v19.9.0](https://github.com/nophead/NopSCADlib/releases/tag/v19.9.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v19.8.1...v19.9.0 "diff with v19.8.1")
+*   2022-02-11 [`95b6771`](https://github.com/nophead/NopSCADlib/commit/95b6771811fd48af46b5c2d426c42c04cd8e5af3 "show commit") [C.P.](# "Chris Palmer") Added printed cable clips.
+
+*   2022-02-11 [`ed46cbb`](https://github.com/nophead/NopSCADlib/commit/ed46cbb1470587d4fa3ee4e0e8e0513c82693b1b "show commit") [C.P.](# "Chris Palmer") Fixed `cable_bundle()` bugs and added test.
+Added `cable_bundle_positions()`.
+Can now mark cables as ribbon to force a flat layout.
+
 #### [v19.8.1](https://github.com/nophead/NopSCADlib/releases/tag/v19.8.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v19.8.0...v19.8.1 "diff with v19.8.0")
 *   2022-02-09 [`2a2b7d8`](https://github.com/nophead/NopSCADlib/commit/2a2b7d8bd60f0ea8ad2c428593e7aea1dfa06e9c "show commit") [C.P.](# "Chris Palmer") Added a second example project.
 

printed/ribbon_clamp.scad

@@ -105,7 +105,7 @@ assembly(let(screw_d = screw_radius(screw) * 2)str("ribbon_clamp_", str_ways(way
 
 module ribbon_clamp_fastened_assembly(ways, thickness, screw = screw) { //! Clamp with fasteners in place
     tape_l = floor(ribbon_clamp_slot(ways));
-    tape_width = 25;
+    tape_width = ribbon_clamp_width(screw) + 2;
     tape_thickness = 0.5;
 
     vitamin(str(": Tape self amalgamating silicone ",tape_l," x 25mm"));

utils/sweep.scad

@@ -215,12 +215,16 @@ function rounded_path(path) = //! Convert a rounded_path, consisting of a start
             p0 - p1,                                    // Calculate vectors between vertices
             v2 = p2 - p1,
             a = angle_between(v1, -v2),                 // Angle turned through
-            arc_start = p1 + unit(v1) * r * tan(a / 2), // Calc the start position
+            d = r * tan(a / 2),                         // Distance from vertex to tangents
+            room = min(norm(v1), norm(v2)),             // Maximum distance
+            arc_start = assert(d <= room,
+                str("Can't fit radius ", r, " into corner at vertex path[", i, "] = ", p1, " only room for radius ", room / tan(a / 2)))
+                p1 + unit(v1) * d,                      // Calc the start position
             z_axis = unit(cross(v1, v2)),               // z_axis is perpendicular to both vectors
             centre = arc_start + unit(cross(z_axis, v1)) * r, // Arc center is a radius away, and perpendicular to v1 and the z_axis.
             x_axis = arc_start - centre,                // Make the x_axis along the radius to the start point, includes radius a scale factor
             y_axis = cross(x_axis, z_axis),             // y_axis perpendicular to the other two
-            sides = r2sides(ceil(r2sides(r) * a / 360)) // Sides needed to make the arc
+            sides = ceil(r2sides(r) * a / 360)          // Sides needed to make the arc
         )
         for(j = [0 : sides], t = a * j / sides)         // For each vertex in the arc
             cos(t) * x_axis + sin(t) * y_axis + centre, // Circular arc in the tiled xy plane.
@@ -240,7 +244,7 @@ function segmented_path(path, min_segment) = [  //! Add points to a path to enfo
 ];
 
 function spiral_paths(path, n, r, twists, start_angle) = let( //! Create a new paths which sprial around the given path. Use for making twisted cables
-        segment = path_length(path) / twists / r2sides(2 * r),
+        segment = twists ? path_length(path) / twists / r2sides(2 * r) : inf,
         transforms = sweep_transforms(segmented_path(path, segment), twist = 360 * twists),
         initial = [r, 0, 0, 1] * rotate(start_angle)
     ) [for(i = [0 : n - 1]) let(initial = [r, 0, 0, 1] * rotate(start_angle + i * 360 / n)) [for(t = transforms) initial * t]];

vitamins/smd.scad

@@ -153,7 +153,7 @@ module smd_sot(type, value) { //! Draw an SMD transistor
     ls = smd_sot_lead_size(type);
 
     r = ls.z;
-    gullwing = rounded_path([[0, 0, ls.z / 2], [0, ls.y - ls.z, ls.z / 2], r, [0, ls.y -ls.z + z1 - ls.z, z1 - ls.z / 2], r, [0, span / 2, z1 - ls.z / 2]]);
+    gullwing = rounded_path([[0, 0, ls.z / 2], [0, ls.y - ls.z, ls.z / 2], r, [0, ls.y -ls.z + z1 - ls.z, z1 - ls.z / 2], r, [0, span / 2, z1 - ls.z / 2]], $fn = 32);
 
     color(grey(20))
         hull()