Added semi_teardrop.

mouse_grommets now teardropped.

printed/cable_grommets.scad

@@ -149,12 +149,17 @@ module mouse_grommet_hole(r, h = 50, z = undef, expand = wall + clearance) //! M
         hull(){
             R = r + expand;
             translate([0, z == undef ? R : z])
-                semi_circle(R);
+                if(expand)
+                    semi_circle(R);
+                else
+                    semi_teardrop(r = R, h = 0);
 
             translate([-R, 0])
                 square([2 * R, eps]);
         }
 
+function mouse_grommet_offset(r) = r + wall;
+
 module mouse_grommet(r, thickness) { //! Make the STL for a mouse grommet
     stl(str("mouse_grommet_", r * 10, "_", thickness));
 
@@ -167,7 +172,7 @@ module mouse_grommet(r, thickness) { //! Make the STL for a mouse grommet
                 translate_z(side * (width - wall) / 2)
                     linear_extrude(height = wall, center = true)
                         difference() {
-                            mouse_grommet_hole(r + wall + overlap, z = r + wall, h = 0, expand = 0);
+                            mouse_grommet_hole(r, z = r + wall, h = 0, expand = wall + overlap);
 
                         translate([0, wall])
                             mouse_grommet_hole(r, h = 0, expand = 0);

readme.md

@@ -4589,6 +4589,7 @@ Small holes can get away without it, but they print better with truncated teardr
 ### Modules
 | Module | Description |
 |:--- |:--- |
+| ```semi_teardrop(h, r, d = undef, center = true)``` | A semi teardrop in the positive Y domain |
 | ```teardrop(h, r, center = true, truncate = true)``` | For making horizontal holes that don't need support material, set ```truncate = false``` to make traditional RepRap teardrops that don't even need bridging |
 | ```teardrop_plus(h, r, center = true, truncate = true)``` | Slightly bigger teardrop to allow for the 3D printing staircase effect |
 | ```tearslot(h, r, w, center = true)``` | A horizontal slot that doesn't need support material |

tests/teardrops.scad

@@ -36,7 +36,10 @@ module teardrops() {
                         tearslot(h = 0, r = 3, w = 10);
 
                     translate([30, 15])
-                         vertical_tearslot(h = 0, r =3, l = 10);
+                        vertical_tearslot(h = 0, r =3, l = 10);
+
+                    translate([20, 10])
+                        semi_teardrop(h = 0, r = 3);
                 }
 }
 

utils/core/teardrops.scad

@@ -34,6 +34,18 @@ module teardrop(h, r, center = true, truncate = true) //! For making horizontal
                     polygon([[0, 0], [eps, 0], [0, r * sqrt(2)]]);
             }
 
+module semi_teardrop(h, r, d = undef, center = true) //! A semi teardrop in the positive Y domain
+    render(convexity = 5)
+        extrude_if(h, center)
+            intersection() {
+                R = is_undef(d) ? r : d / 2;
+                teardrop(r = R, h = 0);
+
+                sq = R + 1;
+                translate([-sq, 0])
+                    square([2 * sq, sq]);
+            }
+
 module teardrop_plus(h, r, center = true, truncate = true) //! Slightly bigger teardrop to allow for the 3D printing staircase effect
     teardrop(h, r + layer_height / 4, center, truncate);