Would help to include the code!

readme.md

@@ -989,8 +989,8 @@ Larger ones seem to have both a higher dark resistance and a lower bright light
 ### Vitamins
 | Qty | Module call | BOM entry |
 | ---:|:--- |:---|
-|   1 | ```ldr(large_ldr)``` |  Light dependent resistor |
-|   1 | ```ldr(small_ldr)``` |  Light dependent resistor |
+|   1 | ```ldr(large_ldr)``` |  Light dependent resistor - large |
+|   1 | ```ldr(small_ldr)``` |  Light dependent resistor - small |
 
 
 <a href="#top">Top</a>
@@ -4511,6 +4511,7 @@ Global constants, functions and modules. This file is used directly or indirectl
 | ```ellipse(xr, yr)``` | Draw an ellipse |
 | ```extrude_if(h, center = true)``` | Extrudes 2D object to 3D when ```h``` is nonzero, otherwise leaves it 2D |
 | ```hflip()``` | Invert children by doing a 180&deg; flip around the Y axis |
+| ```right_triangle(width, height, h, center = true)``` | A right angled triangle with the 90&deg; corner at the origin. 3D when ```h``` is nonzero, otherwise 2D |
 | ```semi_circle(r, d = undef)``` | A semi circle in the positive Y domain |
 | ```translate_z(z)``` | Shortcut for Z only translations |
 | ```vflip()``` | Invert children by doing a 180&deg; flip around the X axis |

tests/fillet.scad

@@ -20,7 +20,8 @@ include <../global_defs.scad>
 use <../utils/fillet.scad>
 
 module fillets() {
-    fillet(3, 25);
+    rotate(180)
+        fillet(3, 10);
 }
 
 fillets();

tests/global.scad

@@ -25,6 +25,9 @@ module globals() {
 
         translate([30, 0])
             ellipse(15, 7);
+
+        translate([50, 0])
+            right_triangle(10, 20, 0);
     }
 }
 

utils/core/global.scad

@@ -63,6 +63,10 @@ module semi_circle(r, d = undef)                    //! A semi circle in the pos
             square([2 * sq, sq]);
     }
 
+module right_triangle(width, height, h, center = true) //! A right angled triangle with the 90° corner at the origin. 3D when ```h``` is nonzero, otherwise 2D
+    extrude_if(h, center = center)
+        polygon(points = [[0,0], [width, 0], [0, height]]);
+
 include <sphere.scad>
 include <bom.scad>
 include <polyholes.scad>

utils/fillet.scad

@@ -28,5 +28,6 @@ module fillet(r, h, center = false) //! Fillet with specified radius and height
             translate([-eps, -eps, 0])
                 square(r + eps);
 
-            circle(r + eps);
+            translate([r, r])
+                circle(r + eps);
         }

vitamins/ldr.scad

@@ -33,7 +33,7 @@ function ldr_active(type)      = type[6]; //! The active width
 function ldr_lead_d(type)      = type[7]; //! The lead diameter
 
 module LDR(type, lead_length = 3) { //! Draw an LDR, can specify the lead length
-    vitamin(str("ldr(", type[0], "): Light dependent resistor: ", ldr_description(type)));
+    vitamin(str("ldr(", type[0], "): Light dependent resistor - ", ldr_description(type)));
 
     module shape()
         intersection() {

vitamins/ldrs.scad

@@ -20,8 +20,8 @@
 //
 // Light dependent resistors.
 //
-small_ldr = ["small_ldr", "small", 5,   4.2, 1.8, 3.2, 2.5, 0.4];
-large_ldr = ["large_ldr", "large", 9.2, 7.9, 1.8, 6.8, 4.5, 0.5];
+small_ldr = ["small_ldr", "small", 5,   4.2, 2.0, 3.2, 2.5, 0.4];
+large_ldr = ["large_ldr", "large", 9.2, 7.9, 2.0, 6.8, 4.5, 0.5];
 
 ldrs = [small_ldr, large_ldr];
 

vitamins/nut.scad

@@ -58,7 +58,7 @@ module nut(type, nyloc = false, brass = false, nylon = false) { //! Draw specifi
                     rounded_cylinder(r = outer_rad * cos(30) , h = nyloc_thickness, r2 = (nyloc_thickness - thickness) / 2, ir = hole_rad);
         }
     if($children)
-        translate_z(thickness)
+        translate_z(nut_thickness(type, nyloc))
             children();
 }
 

vitamins/pcb.scad

@@ -750,14 +750,19 @@ module pcb(type) { //! Draw specified PCB
                 }
 }
 
-module pcb_spacer(screw, height, wall = 1.8) { //! Generate STL for PCB spacer
-    stl(str("pcb_spacer", round(screw_radius(screw) * 20), round(height * 10)));
+module pcb_spacer(screw, height, wall = 1.8, taper = 0) { //! Generate STL for PCB spacer
+    stl(str("pcb_spacer", round(screw_radius(screw) * 20), round(height * 10), taper ? str("_", taper) : ""));
 
     ir = screw_clearance_radius(screw);
     or = corrected_radius(ir) + wall;
 
-    linear_extrude(height = height)
-        poly_ring(or, ir);
+    if(height > taper)
+        linear_extrude(height = height - taper)
+            poly_ring(or, ir);
+
+    if(taper)
+        linear_extrude(height = height)
+            poly_ring(ir + 2 * extrusion_width, ir);
 }
 
 module pcb_base(type, height, thickness, wall = 2) { //! Generate STL for a base with PCB spacers
@@ -798,12 +803,8 @@ module pcb_assembly(type, height, thickness) { //! Draw PCB assembly with spaces
                 screw(screw, screw_length);
 
             color(pp1_colour)
-                if(taper) {
-                    h2 = max(0,  height - 2);
-                    if(h2)
-                        pcb_spacer(screw, h2);
-                    pcb_spacer(screw, height, 2 * extrusion_width); // Thin as can be at the top because there is no clearance around the holes.
-                }
+                if(taper)
+                    pcb_spacer(screw, height, taper = 2);
                 else
                     pcb_spacer(screw, height);