Added sliding t nuts. Sizes M3, M4 and M5.

tests/nuts.scad

@@ -45,6 +45,19 @@ module nuts() {
             if(n == M8_nut)
                 #nut_trap(M8_cap_screw, n, h = 30);
         }
+
+    translate([0, 60])
+        layout([for(n = nuts) 2 * nut_radius(n)], 5) let(n = nuts[$i]) {
+            if(n == M3_nut)
+                sliding_t_nut(M3_sliding_t);
+
+            if(n == M4_nut)
+                sliding_t_nut(M4_sliding_t);
+
+            if(n == M5_nut)
+                sliding_t_nut(M5_sliding_t);
+
+        }
 }
 
 if($preview)

vitamins/nut.scad

@@ -108,6 +108,45 @@ module wingnut(type) { //! Draw a wingnut
                 }
     }
 }
+
+module sliding_t_nut(type) { //! Draw a sliding T-nut
+    vitamin(str("sliding_t_nut(", type[0], "): Sliding T-nut M", nut_size(type)));
+
+    hole_diameter  = nut_size(type);
+    sizeX = type[7];
+    sizeY = type[2];
+    tabSizeY1 = type[8];
+    tabSizeY2 = type[9];
+    nut_thickness = nut_thickness(type);
+    tabSizeZ = type[10];
+
+    color(grey70) {
+        // center section
+        linear_extrude(nut_thickness - tabSizeZ)
+            difference() {
+                square([sizeX, sizeY], center = true);
+                circle(d = hole_diameter);
+            }
+        translate_z(nut_thickness - tabSizeZ)
+            linear_extrude(tabSizeZ)
+                difference() {
+                    square([sizeX, tabSizeY2], center = true);
+                    circle(d = hole_diameter);
+                }
+        // add the side tabs
+        for(m = [0, 1])
+            mirror([0, m, 0])
+                translate([0, tabSizeY2 / 2, nut_thickness - tabSizeZ]) {
+                    cubeZ = 1;
+                    translate([-sizeX / 2, 0, 0])
+                        cube([sizeX, (tabSizeY1 - tabSizeY2) / 2, cubeZ]);
+                    translate_z(cubeZ)
+                        rotate([0, -90, 0])
+                            right_triangle(tabSizeZ - cubeZ, (tabSizeY1 - tabSizeY2) / 2, sizeX, center = true);
+                }
+    }
+}
+
 function nut_trap_radius(nut, horizontal = false) = nut_radius(nut) + (horizontal ? layer_height / 4 : 0); //! Radius across the corners of a nut trap
 function nut_trap_flat_radius(nut, horizontal = false) = nut_trap_radius(nut, horizontal) * cos(30);       //! Radius across the flats of a nut trap
 

vitamins/nuts.scad

@@ -51,6 +51,11 @@ toggle_nut  = ["toggle_nut",  6.1, 9.2, 1.5, 1.5,  M6_washer,     1.5];
 
 M4_wingnut  = ["M4_wingnut",  4,  10,   3.75,8,    M4_washer,     0, 22, 10, 6, 3];
 
+//                                                                   sx ty1 ty2 tz
+M3_sliding_t= ["M3_sliding_t_nut",3, 6, 4.0, 0,    M3_washer,     0, 10, 10,  6, 3];
+M4_sliding_t= ["M4_sliding_t_nut",4, 6, 4.5, 0,    M4_washer,     0, 11, 10,  6, 3.25];
+M5_sliding_t= ["M5_sliding_t_nut",5, 7, 4.5, 0,    M5_washer,     0, 11, 10,  7, 3.25];
+
 nuts = [M2_nut, M2p5_nut, M3_nut, M4_nut, M5_nut, M6_nut, M8_nut];
 
 use <nut.scad>