second version of lampshades and separate nut

README.md

@@ -1,13 +1,27 @@
 # lampshades models
 
-My lampshade on the Ikea lamp is similar to [HEKTOGRAM](https://www.ikea.com/cz/cs/p/hektogram-stojaci-cteci-lampa-stribrna-bila-80477710/) was broken. I thought about buying a new light, but I wouldn't say I like the latest version of the lamp, and I'm a happy owner of a 3D printer.
+My lampshade on the Ikea lamp is similar to [HEKTOGRAM](https://www.ikea.com/cz/cs/p/hektogram-stojaci-cteci-lampa-stribrna-bila-80477710/) was broken. As a owner of 3D printing I tried to make new lapmshade.
 
 I have two versions of lampshades; both are made in amazing [OpenSCAD](https://openscad.org) and are fully customizable.
 
 The first model which I made is `lampshade_conical.scad`. That was the easier one. But I wanted to have the lampshade more curved, so I did the second model, `lampshade_curved.scad`.
 
-Configuration of the `lampshade_conical` is pretty simple, and the second is more complex - you need to play with `curved_factor` to find a proper design and height.
+Configuration of the `lampshade_conical` is pretty simple, and the second is a little bit complex - you need to play with `curved_factor` to find a proper design and height.
 
-And btw. I lost the nut for the lampshade. That is the reason why my models contain nuts. If you don't want nut—comment `nut` line.
+And btw. I lost the nut for the lampshade.
+
+My first models contain nuts as part of lampshade, but it wasn't a good design, so I made a separate `./nut.scad` again - fully customizable.
+
+Thanks to decision to separate lampshade and nut (the original set up of the lamp btw.) I'm fully flexible.
 
 I wish you a lot of fun with modeling (and printing).
+
+## how to install dependencies for nut?
+I use [threadlib](https://github.com/adrianschlatter/threadlib)
+
+you need to install (download or checkout) to the [OpenSCAD library folder](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Libraries)
+those repositories:
+* [threadlib](https://github.com/adrianschlatter/threadlib)
+* [scad-utils](https://github.com/openscad/scad-utils)
+* [list-compohension](https://github.com/openscad/list-comprehension-demos)
+* [thread_profile.scad](https://github.com/MisterHW/IoP-satellite/blob/master/OpenSCAD%20bottle%20threads/thread_profile.scad)

lampshade_conical.scad

@@ -1,7 +1,5 @@
-use <threadlib/threadlib.scad>
-
 height = 110;
-bottom_d = 70;
+bottom_d = 44;
 top_d = 170;
 facets = 40;
 
@@ -13,6 +11,4 @@ difference() {
 cylinder(height, bottom_r, top_r, $fn=facets);
 translate([0,0,-0.01])
     cylinder(height+0.02, bottom_r-thickness, top_r-thickness, $fn=facets);
-}
-
-nut("M42x3", turns=2, Douter=bottom_d);
+}

lampshade_curved.scad

@@ -1,28 +1,23 @@
-use <threadlib/threadlib.scad>
-
-x = 250;
+curved_factor = 79;
 thickness = 2;
-top_d = 170;
-bottom_d = 70;
-
+top_d = 179;
+bottom_d = 44;
 
 difference() {
-    rotate_extrude($fn=100)
+    rotate_extrude($fn=200)
     difference() {
-        polygon(bowl(top_d,x));
-        offset(-thickness) polygon(bowl(top_d+thickness,x));
+        polygon(bowl(top_d/2,curved_factor));
+        offset(-thickness) polygon(bowl(top_d/2+thickness,curved_factor));
     };
     cylinder(top_d, bottom_d/2, bottom_d/2);
 }
 
-nut("M42x3", turns=2, Douter=bottom_d);
-
 function point(i, R) = [
   i,
   i*i/R
 ];
 
-function bowl(height, x_factor) = (
+function bowl(height, x) = (
  concat(
     [ for (i = [0:1:height]) point(i, x) ],
     [[0,height*height/x]]

nut.scad

@@ -0,0 +1,30 @@
+use <threadlib/threadlib.scad>
+
+turns = 2;
+bottom_d = 70;
+diameter = 42;
+len_between_threads = 3;
+holder_height = 5;
+holder_weight = 5;
+holders = 3;
+
+nut_type = str("M",diameter,"x",len_between_threads);
+
+height_of_nut = turns * len_between_threads;
+
+nut(nut_type, turns=turns, Douter=bottom_d);
+difference() {
+    holders();
+
+    translate([0,0,height_of_nut-0.01])
+        cylinder(holder_height+0.02, diameter/2, diameter/2);
+}
+
+module holders() {
+    shift = 180 / holders;
+    
+    for(angle = [0:shift:360])
+    translate([0,0,height_of_nut + holder_height/2])
+        rotate(angle)
+            cube([holder_height,bottom_d,holder_weight], center=true);
+};