Add sd_card_holder model. Add helper script.

.gitignore

+out

dump_csg.sh

+#!/bin/sh
+
+dir=out/${1:-default}
+mkdir -p $dir
+
+for file in $(find src -type f -name '*.scad'); do
+    a=${file##*/}
+    b=$dir/${a%.scad}.csg
+    printf 'CSG %s -> %s\n' $file $b
+    openscad $file --hardwarnings -o $b
+done

include/common_objects.scad

+co_sd_card = [32, 24, 2.1];
+co_usd_card = [15, 11, 1];

include/screw.scad

@@ -49,6 +49,8 @@ module _screw_thread(N=10, R=10, R_min=12, R_maj=15, P=3, taper=true) {
     );
 }
 
+function metric_screw_d_min(P, D_maj, tol=0) = 2 * (D_maj/2+tol-5/16*sqrt(3)*P);
+
 /*
     P: pitch
     D_maj: major diameter
@@ -58,7 +60,7 @@ module _screw_thread(N=10, R=10, R_min=12, R_maj=15, P=3, taper=true) {
 */
 module metric_screw(P=3, D_maj=14, tol=0, h=30, taper=true) {
     R_maj=D_maj/2+tol;
-    R_min=R_maj-5/16*sqrt(3)*P;
+    R_min=metric_screw_d_min(P, D_maj, tol) / 2;
     R=R_min-sqrt(3)/8*P;
     N=ceil(h/P);
     intersection() {

src/pill_box.scad

-use </home/kgy/repos/3d_models/include/screw.scad>;
+use <../include/screw.scad>;
 
 slots=8;
 r=40;
@@ -121,4 +121,4 @@ module segment() {
             ]);
         }
     }
-}
\ No newline at end of file
+}

src/rpi_case.scad

@@ -124,12 +124,16 @@ module case_top() {
             }
         }
         rpi(5);
-        translate([pcb.x/2, pcb.y/2, space_below+pcb.z + space_above + corner_r - corner_r/2]) linear_extrude(h=corner_r) text("rPi", halign="center", valign="center", font="DejaVu Sans Mono", size=17);
+        translate([pcb.x/2, pcb.y/2, space_below+pcb.z + space_above + corner_r - corner_r/2]) linear_extrude(corner_r) text("rPi", halign="center", valign="center", font="DejaVu Sans Mono", size=17);
     }
     case_lip(1, 0.3);
     pillars_top();
 }
 
-//rpi();
-//case_bottom();
-translate([0, 0, 10]) rotate([180, 0, 0]) case_top();
\ No newline at end of file
+module canonical() {
+translate([0,10,corner_r]) case_bottom();
+translate([0, 0, space_below + pcb.z + space_above + corner_r]) rotate([180, 0, 0]) case_top();
+translate([0,pcb.y + 20,0]) rpi();
+}
+
+canonical();

src/sd_card_holder.scad

+use <../include/screw.scad>;
+include <../include/common_objects.scad>;
+
+module flower2(r = 10, v = .2, n = 15) {
+    function rfn(a) = r - abs(sin(a*n))*v;
+    polygon([ for (i=[0:0.25:359.9999])
+        [ cos(i)*rfn(i), sin(i)*rfn(i) ] ]);
+}
+
+s_sd = co_sd_card + [.7, .5, .5];
+s_usd = co_usd_card + [.5, .5, .4];
+s_ad = [12, 25.1, 2.7] + [.4, .4, .3];
+
+/*function n_parents(s, i = 0) = i < $parent_modules ?
+n_parents(s, i + 1) + (parent_module(i) == s ? 1 : 0) :
+    0;*/
+
+/*
+    R: outside radius
+    r: inside radius
+    h: total outside height
+    w: top wall thickness
+    g: inside gap
+*/
+module screw_box(R = 10, r = -1, h = 10, w = 1, g = 0,
+    txt = "", txt_size = 0) {
+    h2 = h / 2;
+    _r = r < 0 ? R * 0.9 : r;
+    P = (h2-w-g)/2;
+    tol = 0.7;
+    d_min = metric_screw_d_min(P = P, D_maj = 2*_r,
+        tol = tol);
+    module shape() { flower2(r = R, v = R * 0.025); }
+    module screw(tol = 0) {
+        intersection() {
+            translate([0,0,h-w-g])
+            rotate([180,0,0])
+            metric_screw(P=P,
+            D_maj=_r*2,tol=tol,taper=true);
+            translate([-R,-R,0])
+            cube([R*2,R*2, h-w]);
+        }
+    }
+    module base() {
+        intersection() {
+            union() {
+                linear_extrude(h2) shape();
+                screw();
+            }
+            corner_r = 6;
+            minkowski() {
+                translate([0,0,corner_r])
+                    cylinder(r=R - corner_r, h=h, $fn=70);
+                sphere(r=corner_r, $fn=50);
+            }
+        }
+    }
+    module cap() {
+        difference() {
+            translate([0,0,h2]) linear_extrude(h2)
+                shape();
+            screw(tol = 0.7);
+            cylinder(d=d_min, h = h-w, $fn=100);
+            translate([0,0,h-w/2]) linear_extrude(w)
+                text(txt, halign="center",
+                valign="center", size=txt_size);
+        }
+    }
+    /* cap = n_parents("mark_cap") > 0;
+    flat = n_parents("mark_flat") > 0;
+    aside = n_parents("mark_aside") > 0; */
+    cap = !is_undef($mark_cap);
+    flat = !is_undef($mark_flat);
+    aside = !is_undef($mark_aside);
+    translate([aside ? 2*R : 0, 0, 0])
+    if (!cap) { base(); } else {
+        if (flat) {
+            translate([0,0,h]) rotate([180,0,0]) cap();
+        } else { cap(); }
+    }
+}
+
+/*module mark_cap() { children(); }
+module mark_flat() { children(); }
+module mark_aside() { children(); }*/
+
+module screw_box_params() {
+    screw_box(R = 22.5, h = s_sd.y + 2.5, g = 3,
+        txt = "SD cards", txt_size = 7.5);
+}
+
+module sd_cards() {
+    g = 3;
+    G = 2;
+    module sd() {
+    translate([-s_sd.x/2,-G/2,1])
+            rotate([90,0,0]) cube(s_sd);
+    }
+    module usd() {
+        translate([-g/2 + s_usd.z/2,
+            s_sd.z + 1,
+            s_sd.y - s_usd.x + 1])
+        rotate([0,-90,0]) cube(s_usd);
+    }
+    module usds() { for (i = [0:2])
+        translate([-g*i,0,0]) usd(); }
+    module usdss() { mirror([1,0,0]) usds(); usds(); }
+    usdss();
+    translate([0,-1,0]) {
+    sd();
+    mirror([0,1,0]) sd();
+    translate([s_ad.y/2, -5.5, s_sd.y - s_ad.x + 1])
+        rotate([0,-90,90]) cube(s_ad);
+    }
+
+    //translate([0,-1,26]) scale([1,1.3,1]) sphere(r=10, $fn=100);
+    translate([0,0,33]) sphere(r=19, $fn=100);
+}
+
+module base() {
+    difference() { screw_box_params(); sd_cards(); }
+}
+module cap() {
+    $mark_cap = true;
+    screw_box_params();
+}
+
+module assembled() {
+    base();
+    translate([0,0,.1]) cap();
+}
+
+module print() {
+     translate([1,0,0]) {
+        $mark_aside = true; $mark_flat = true; cap(); }
+    base();
+}
+
+print();

src/tablet_holder.scad

-use <../../include/rounded_square.scad>;
+use <../include/rounded_square.scad>;
 
 wall_t = 5; //wall thickness
 wall_front = 19-2; //wall height on the front