first models

README.md

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+# 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.
+
+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.
+
+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.
+
+I wish you a lot of fun with modeling (and printing).

lampshade_conical.scad

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+use <threadlib/threadlib.scad>
+
+height = 110;
+bottom_d = 70;
+top_d = 170;
+facets = 40;
+
+bottom_r=bottom_d/2;
+top_r=top_d/2;
+thickness=2;
+
+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

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+use <threadlib/threadlib.scad>
+
+x = 250;
+thickness = 2;
+top_d = 170;
+bottom_d = 70;
+
+
+difference() {
+    rotate_extrude($fn=100)
+    difference() {
+        polygon(bowl(top_d,x));
+        offset(-thickness) polygon(bowl(top_d+thickness,x));
+    };
+    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) = (
+ concat(
+    [ for (i = [0:1:height]) point(i, x) ],
+    [[0,height*height/x]]
+ )
+);