created models

openscad/stress_test_models.scad~

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+#!/usr/bin/openscad -o /tmp/ignore.stl
+//
+// stress_test_models.scad
+// 20260317 ChatGPT
+// $Id$
+// $HeadURL$
+//
+// Example command lines:
+//
+//   openscad -D 'model="cube"'  -o cube_20260317_1335.stl  stress_test_models.scad
+//   openscad -D 'model="ybar"'  -o ybar_20260317_1335.stl  stress_test_models.scad
+//   openscad -D 'model="tower"' -o tower_20260317_1335.stl stress_test_models.scad
+//   openscad -D 'model="all"'   -o all_20260317_1335.stl   stress_test_models.scad
+//
+// Suggested slicer use:
+//
+//   1) Print each model as a SEPARATE run.
+//   2) For ybar, orient the LONG dimension along the printer's Y axis
+//      so the bed moves the long way front-to-back.
+//   3) Infill is set in Orca Slicer, not here.
+//
+// Suggested slicer settings:
+//
+//   cube:  0.20 layer, 3 perimeters, 20-25% grid or gyroid
+//   ybar:  0.20 layer, 3 perimeters, 15-25% grid
+//   tower: 0.20 layer, 3 perimeters, 0-10% infill, no brim at first;
+//          add brim only if adhesion becomes the issue rather than motion
+//
+
+/* [General] */
+model = "all";              // [cube,ybar,tower,all]
+center_models = false;      // true / false
+add_labels = true;          // true / false
+
+/* [Cube Dimensions] */
+cube_x = 40;
+cube_y = 40;
+cube_z = 40;
+
+/* [Y Bar Dimensions] */
+ybar_x = 20;
+ybar_y = 150;
+ybar_z = 50;
+
+/* [Tower Dimensions] */
+tower_x = 18;
+tower_y = 18;
+tower_z = 120;
+
+/* [Edge Treatment] */
+corner_radius = 1.2;        // 0 for sharp corners
+$fn = 48;
+
+/* [Labeling] */
+label_depth = 0.6;
+label_size  = 7;
+label_font  = "Liberation Sans:style=Bold";
+
+/* [Layout For model="all"] */
+gap_between_models = 20;
+
+
+// --------------------------------------------------
+// Main
+// --------------------------------------------------
+
+if (model == "cube") {
+    make_cube();
+}
+else if (model == "ybar") {
+    make_ybar();
+}
+else if (model == "tower") {
+    make_tower();
+}
+else if (model == "all") {
+    make_all();
+}
+else {
+    echo("ERROR: model must be one of: cube, ybar, tower, all");
+}
+
+
+// --------------------------------------------------
+// Assemblies
+// --------------------------------------------------
+
+module make_all() {
+    x0 = 0;
+    x1 = x0 + cube_x + gap_between_models;
+    x2 = x1 + ybar_x + gap_between_models;
+
+    translate([x0, 0, 0]) make_cube();
+    translate([x1, 0, 0]) make_ybar();
+    translate([x2, 0, 0]) make_tower();
+}
+
+
+module make_cube() {
+    difference() {
+        rounded_box(cube_x, cube_y, cube_z, corner_radius, center_models);
+        if (add_labels)
+            place_top_label("CUBE", cube_x, cube_y, cube_z, center_models);
+    }
+}
+
+
+module make_ybar() {
+    difference() {
+        rounded_box(ybar_x, ybar_y, ybar_z, corner_radius, center_models);
+        if (add_labels)
+            place_top_label("YBAR", ybar_x, ybar_y, ybar_z, center_models);
+    }
+}
+
+
+module make_tower() {
+    difference() {
+        rounded_box(tower_x, tower_y, tower_z, corner_radius, center_models);
+        if (add_labels)
+            place_top_label("TOWER", tower_x, tower_y, tower_z, center_models);
+    }
+}
+
+
+// --------------------------------------------------
+// Geometry helpers
+// --------------------------------------------------
+
+module rounded_box(x, y, z, r=0, center_it=false) {
+    if (r <= 0) {
+        cube([x, y, z], center=center_it);
+    } else {
+        if (center_it) {
+            translate([-x/2, -y/2, -z/2])
+                rounded_box_uncentered(x, y, z, r);
+        } else {
+            rounded_box_uncentered(x, y, z, r);
+        }
+    }
+}
+
+
+module rounded_box_uncentered(x, y, z, r) {
+    linear_extrude(height=z)
+        offset(r=r)
+            offset(delta=-r)
+                square([x, y], center=false);
+}
+
+
+module place_top_label(txt, x, y, z, center_it=false) {
+    tx = center_it ? 0 : x/2;
+    ty = center_it ? 0 : y/2;
+    tz = center_it ? z/2 : z;
+
+    translate([tx, ty, tz - label_depth])
+        linear_extrude(height=label_depth + 0.02)
+            text(
+                txt,
+                size=label_size,
+                font=label_font,
+                halign="center",
+                valign="center"
+            );
+}