diff --git a/src/dev-utils/OrcaSlicer_profile_validator.cpp b/src/dev-utils/OrcaSlicer_profile_validator.cpp
index 56acbaa732..557dda7eec 100644
--- a/src/dev-utils/OrcaSlicer_profile_validator.cpp
+++ b/src/dev-utils/OrcaSlicer_profile_validator.cpp
@@ -122,17 +122,19 @@ Vec2d printable_area_center(const DynamicPrintConfig &cfg)
 
 // Put the prime tower where the GUI and CLI would before slicing. The config default (x 15, y 220)
 // lies off any bed shallower than the tower, and generation rejects an off-plate tower instead of
-// exporting it. Beside the centred cube, clear of the edge exclusion strips some beds carry, then
-// pulled inside the printable outline by the tower's own estimated footprint, with a few mm of
-// clearance so the conflict checker never sees the two touch.
-void place_wipe_tower(DynamicPrintConfig &cfg, const Vec2d &center)
+// exporting it. Beside the cube at the bed centre, clear of the edge exclusion strips some beds
+// carry, with a few mm of clearance so the conflict checker never sees the two touch. The cube and
+// the tower's estimated footprint are then pulled inside the printable outline as one rigid pair:
+// moving the tower alone would push it back onto the cube on a narrow bed. Returns that move for
+// the cube.
+Vec2d place_wipe_tower(DynamicPrintConfig &cfg, const Vec2d &center)
 {
     const auto *area = cfg.option<ConfigOptionPoints>("printable_area");
     if (area == nullptr || area->values.size() < 3)
-        return;
+        return Vec2d::Zero();
     const WipeTowerFootprint footprint = estimate_wipe_tower_footprint(cfg, resolve_wipe_tower_type(cfg), {0, 1}, cfg.opt_float("layer_height"), 10.);
     if (footprint.depth < EPSILON)
-        return;
+        return Vec2d::Zero();
     const double margin = WIPE_TOWER_MARGIN + footprint.brim_width;
     // The position is the tower's own origin; a rotated tower extends from it in another
     // direction, so place the rotated box's extents rather than the origin.
@@ -143,13 +145,22 @@ void place_wipe_tower(DynamicPrintConfig &cfg, const Vec2d &center)
     const Vec2d       size  = unscale(local.max) - lo;
     Vec2d             pos(center.x() + 5. + margin + 5. - lo.x(), center.y() - size.y() / 2. - lo.y());
     box.translate(Point::new_scale(pos.x(), pos.y()));
-    const Vec2f move = WipeTower::move_box_inside_polygon(get_extents(box), Polygons{Polygon::new_scale(area->values)}, scaled<coord_t>(margin));
-    pos += move.cast<double>();
+    // A bed too small for the pair keeps the cube at its centre and places the tower alone.
+    const Polygons    bed{Polygon::new_scale(area->values)};
+    const BoundingBox tower = get_extents(box);
+    BoundingBox       pair  = tower;
+    pair.merge(Point::new_scale(center.x() - 5., center.y() - 5.));
+    pair.merge(Point::new_scale(center.x() + 5., center.y() + 5.));
+    const Point       room  = get_extents(bed).size() - Point::new_scale(2. * margin, 2. * margin);
+    const bool        rigid = pair.size().x() < room.x() && pair.size().y() < room.y();
+    const Vec2d       move  = WipeTower::move_box_inside_polygon(rigid ? pair : tower, bed, scaled<coord_t>(margin)).cast<double>();
+    pos += move;
     cfg.option<ConfigOptionFloats>("wipe_tower_x", true)->values = {pos.x()};
     cfg.option<ConfigOptionFloats>("wipe_tower_y", true)->values = {pos.y()};
+    return rigid ? move : Vec2d::Zero();
 }
 
-// Slice one centered cube that switches from filament 1 to filament 2 partway up, so exactly one
+// Slice one cube that switches from filament 1 to filament 2 partway up, so exactly one
 // filament change fires, then export. The change drives the printer's own change_filament_gcode: on a
 // single-nozzle machine it rides the AMS prime tower (append_tcr), on a multi-nozzle machine it routes
 // through the nozzle swap (set_extruder / append_tcr2) - the engine picks the path from the printer's
@@ -157,10 +168,10 @@ void place_wipe_tower(DynamicPrintConfig &cfg, const Vec2d &center)
 // Slic3r::PlaceholderParserError from export.
 std::string slice_two_color_cube_and_export(DynamicPrintConfig cfg, bool is_bbl)
 {
-    const Vec2d center = printable_area_center(cfg);
-    place_wipe_tower(cfg, center);
+    const Vec2d center   = printable_area_center(cfg);
+    const Vec2d cube_min = center - Vec2d(5., 5.) + place_wipe_tower(cfg, center);
     TriangleMesh m = make_cube(10, 10, 10);
-    m.translate(float(center.x() - 5.), float(center.y() - 5.), 0.f);
+    m.translate(static_cast<float>(cube_min.x()), static_cast<float>(cube_min.y()), 0.f);
 
     Model  model;
     Print  print;