Removed spurious convexity in difference from rounded_polygon().

CHANGELOG.md

@@ -3,6 +3,27 @@
 This changelog is generated by `changelog.py` using manually added semantic version tags to classify commits as breaking changes, additions or fixes.
 
 
+### [v15.13.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.13.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.12.0...v15.13.0 "diff with v15.12.0")
+*   2021-05-02 [`3401919`](https://github.com/nophead/NopSCADlib/commit/34019196cdac6b08e57d773e138a22394b609ea5 "show commit") [C.P.](# "Chris Palmer") Updated readme
+
+*   2021-05-02 [`436fc71`](https://github.com/nophead/NopSCADlib/commit/436fc71cf319c1e71b6cbd240b76d7cad5ecd8ba "show commit") [M.B.](# "Martin Budden") Added `blower_size` function.
+
+### [v15.12.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.12.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.11.1...v15.12.0 "diff with v15.11.1")
+*   2021-04-26 [`e2feceb`](https://github.com/nophead/NopSCADlib/commit/e2feceb608b4491424c0e4c1e7c191f7d8aeceec "show commit") [C.P.](# "Chris Palmer") Updated readme
+
+*   2021-04-25 [`9c1a9bf`](https://github.com/nophead/NopSCADlib/commit/9c1a9bf3572c07a57b5bd1fde1d9a4aba14e5ea8 "show commit") [M.B.](# "Martin Budden") Add facility to orient `core_xy` with left motor being lower or upper motor.
+
+#### [v15.11.1](https://github.com/nophead/NopSCADlib/releases/tag/v15.11.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.11.0...v15.11.1 "diff with v15.11.0")
+*   2021-04-25 [`feec1e7`](https://github.com/nophead/NopSCADlib/commit/feec1e7ae5a5217586e0ab9e7b002e8af8f7c749 "show commit") [C.P.](# "Chris Palmer") Updated readme.
+
+*   2021-04-25 [`be76af2`](https://github.com/nophead/NopSCADlib/commit/be76af2fc490e10e4dd115a56019e33005f87db9 "show commit") [M.B.](# "Martin Budden") Fixed typo in `leadnut.scad`.
+
+### [v15.11.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.11.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.10.1...v15.11.0 "diff with v15.10.1")
+*   2021-04-25 [`49fdfea`](https://github.com/nophead/NopSCADlib/commit/49fdfea7926d677b6e0a9eee2fbd928f2935e1eb "show commit") [C.P.](# "Chris Palmer") Added 35BYGHJ75 geared stepper.
+
+#### [v15.10.1](https://github.com/nophead/NopSCADlib/releases/tag/v15.10.1 "show release") Fixes [...](https://github.com/nophead/NopSCADlib/compare/v15.10.0...v15.10.1 "diff with v15.10.0")
+*   2021-04-25 [`ac0bacf`](https://github.com/nophead/NopSCADlib/commit/ac0bacfeda43af62256e7bd3184df695b3e01d37 "show commit") [C.P.](# "Chris Palmer") Removed echo in rails test.
+
 ### [v15.10.0](https://github.com/nophead/NopSCADlib/releases/tag/v15.10.0 "show release") Additions [...](https://github.com/nophead/NopSCADlib/compare/v15.9.0...v15.10.0 "diff with v15.9.0")
 *   2021-04-13 [`e379fa8`](https://github.com/nophead/NopSCADlib/commit/e379fa8ada4a4089fc24ce5fc2c140a2531e2e95 "show commit") [C.P.](# "Chris Palmer") Updated readme.
 

readme.md

@@ -373,6 +373,7 @@ Models of radial blowers.
 |:--- |:--- |
 | `blower_casing_is_square(type)` | True for square radial fans, false for spiral shape radial blowers |
 | `blower_exit_offset(type)` | Offset of exit's centre from the edge |
+| `blower_size(type)` | Size |
 
 ### Modules
 | Module | Description |
@@ -1484,7 +1485,7 @@ Nuts for leadscrews.
 | `leadnut_flange_t(type)` | Flange thickness |
 | `leadnut_height(type)` | Total height |
 | `leadnut_hole_dia(type)` | The diameter of the screw holes |
-| `leadnut_hole_pitch(type)` | The radia pitch of the screw holes |
+| `leadnut_hole_pitch(type)` | The radial pitch of the screw holes |
 | `leadnut_holes(type)` | The number of screw holes |
 | `leadnut_lead(type)` | Screw lead |
 | `leadnut_od(type)` | Outer diameter of the shank |
@@ -5685,8 +5686,8 @@ allows flexible positioning of the motors.
 ### Modules
 | Module | Description |
 |:--- |:--- |
-| `coreXY(type, size, pos, separation, x_gap, plain_idler_offset = 0, upper_drive_pulley_offset, lower_drive_pulley_offset, show_pulleys = false)` | Wrapper module to draw both belts of a coreXY setup |
-| `coreXY_belts(type, carriagePosition, coreXYPosBL, coreXYPosTR, separation, x_gap = 20, upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = false)` | Draw the coreXY belts |
+| `coreXY(type, size, pos, separation, x_gap, plain_idler_offset = 0, upper_drive_pulley_offset, lower_drive_pulley_offset, show_pulleys = false, left_lower = false)` | Wrapper module to draw both belts of a coreXY setup |
+| `coreXY_belts(type, carriagePosition, coreXYPosBL, coreXYPosTR, separation, x_gap = 20, upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = false, left_lower = false)` | Draw the coreXY belts |
 | `coreXY_half(type, size, pos, separation_y = 0, x_gap = 0, plain_idler_offset = 0, drive_pulley_offset = [0, 0], show_pulleys = false, lower_belt = false, hflip = false)` | Draw one belt of a coreXY setup |
 
 ![core_xy](tests/png/core_xy.png)

utils/core_xy.scad

@@ -180,24 +180,25 @@ module coreXY_half(type, size, pos, separation_y = 0, x_gap = 0, plain_idler_off
         tooth_colour = lower_belt ? coreXY_lower_tooth_colour(type) : coreXY_upper_tooth_colour(type));
 }
 
-module coreXY(type, size, pos, separation, x_gap, plain_idler_offset = 0, upper_drive_pulley_offset, lower_drive_pulley_offset, show_pulleys = false) { //! Wrapper module to draw both belts of a coreXY setup
+module coreXY(type, size, pos, separation, x_gap, plain_idler_offset = 0, upper_drive_pulley_offset, lower_drive_pulley_offset, show_pulleys = false, left_lower = false) { //! Wrapper module to draw both belts of a coreXY setup
     translate([size.x / 2 - separation.x / 2, size.y / 2, -separation.z / 2]) {
         // lower belt
-        hflip()
+        hflip(!left_lower)
             explode(25)
-                coreXY_half(type, size, [size.x - pos.x - separation.x, pos.y], separation.y, x_gap, plain_idler_offset, [-lower_drive_pulley_offset.x, lower_drive_pulley_offset.y], show_pulleys, lower_belt = true, hflip = true);
+                coreXY_half(type, size, [size.x - pos.x - separation.x/2 - (left_lower ? x_gap : 0), pos.y], separation.y, x_gap, plain_idler_offset, [-lower_drive_pulley_offset.x, lower_drive_pulley_offset.y], show_pulleys, lower_belt = true, hflip = true);
 
         // upper belt
         translate([separation.x, 0, separation.z])
-            explode(25)
-                coreXY_half(type, size, [pos.x, pos.y], separation.y, x_gap, plain_idler_offset, upper_drive_pulley_offset, show_pulleys, lower_belt = false, hflip=false);
+            hflip(left_lower)
+                explode(25)
+                    coreXY_half(type, size, [pos.x + separation.x/2 + (left_lower ? x_gap : 0), pos.y], separation.y, x_gap, plain_idler_offset, upper_drive_pulley_offset, show_pulleys, lower_belt = false, hflip = false);
     }
 }
 
-module coreXY_belts(type, carriagePosition, coreXYPosBL, coreXYPosTR, separation, x_gap = 20, upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = false) { //! Draw the coreXY belts
+module coreXY_belts(type, carriagePosition, coreXYPosBL, coreXYPosTR, separation, x_gap = 20, upper_drive_pulley_offset = [0, 0], lower_drive_pulley_offset = [0, 0], show_pulleys = false, left_lower = false) { //! Draw the coreXY belts
     assert(coreXYPosBL.z == coreXYPosTR.z);
 
     coreXYSize = coreXYPosTR - coreXYPosBL;
     translate(coreXYPosBL)
-        coreXY(type, coreXYSize, [carriagePosition.x - coreXYPosBL.x + separation.x / 2, carriagePosition.y - coreXYPosBL.y], separation = separation, x_gap = x_gap, plain_idler_offset = 0, upper_drive_pulley_offset = upper_drive_pulley_offset, lower_drive_pulley_offset = lower_drive_pulley_offset, show_pulleys = show_pulleys);
+        coreXY(type, coreXYSize, [carriagePosition.x - coreXYPosBL.x, carriagePosition.y - coreXYPosBL.y], separation = separation, x_gap = x_gap, plain_idler_offset = 0, upper_drive_pulley_offset = upper_drive_pulley_offset, lower_drive_pulley_offset = lower_drive_pulley_offset, show_pulleys = show_pulleys, left_lower = left_lower);
 }

utils/rounded_polygon.scad

@@ -77,7 +77,7 @@ module rounded_polygon(points, _tangents = undef) { //! Draw the rounded polygon
     indices = [0 : len - 1];
     tangents = [ for (t = _tangents ? _tangents : rounded_polygon_tangents(points)) each [t.x, t.y] ];
 
-    difference(convexity = points) {
+    difference() {
         union() {
             for(i = indices)
                 if(points[i][2] > 0)

vitamins/blower.scad

@@ -28,6 +28,7 @@ use <screw.scad>
 function blower_length(type)      = type[2]; //! Length of enclosing rectangle
 function blower_width(type)       = type[3]; //! Width of enclosing rectangle
 function blower_depth(type)       = type[4]; //! Height
+function blower_size(type)        = [blower_length(type), blower_width(type), blower_depth(type)]; //! Size
 function blower_bore(type)        = type[5]; //! The air intake hole diameter
 function blower_screw(type)       = type[6]; //! The type of screws needed
 function blower_hub(type)         = type[7]; //! Rotor hub diameter

vitamins/leadnut.scad

@@ -32,7 +32,7 @@ function leadnut_flange_t(type)      = type[6];     //! Flange thickness
 function leadnut_flange_offset(type) = type[7];     //! Offset of the flange from the top
 function leadnut_holes(type)         = type[8];     //! The number of screw holes
 function leadnut_hole_dia(type)      = type[9];     //! The diameter of the screw holes
-function leadnut_hole_pitch(type)    = type[10];    //! The radia pitch of the screw holes
+function leadnut_hole_pitch(type)    = type[10];    //! The radial pitch of the screw holes
 function leadnut_screw(type)         = type[11];    //! The type of the fixing screws
 function leadnut_pitch(type)         = type[12];    //! Screw pitch
 function leadnut_lead(type)          = type[13];    //! Screw lead