diff --git a/fallout_holodisk.scad b/fallout_holodisk.scad
new file mode 100755
index 0000000..b8c2558
--- /dev/null
+++ b/fallout_holodisk.scad
@@ -0,0 +1,53 @@
+/*
+ * Holodisk from Fallout 1 and Fallout 2
+ *
+ * Main source: https://fallout.fandom.com/wiki/Holotape
+ * Inspiration: https://www.artstation.com/artwork/R14Y
+ * Related: http://cedmagic.com/history/holotape.html
+ */
+
+width=55;
+depth=100;
+height=16;
+wall=3;
+plate=3;
+top_rim=2;
+bolt_headtype="hex";
+front_body_depth=12;
+front_body_bolt_offset=8;
+back_bumpers_radius=5;
+back_bumpers_bolt_size=3;
+tape_height=5;
+tape_thickness=0.2;
+spool_tape_tolerance=1;
+spool_inner_height=tape_height+spool_tape_tolerance;
+spool_inner_radius=4;
+spool_outer_radius=18;
+spool_plate_height=2;
+spool_plate_holes=3;
+spool_plate_hole_angle=360/spool_plate_holes * 0.5;
+spool_plate_hole_inner_rim=1;
+spool_plate_hole_outer_rim=4;
+spool_slit_depth=0.8;
+spool1_depth=depth*0.77;
+spool2_depth=depth*0.40;
+spool3_depth=(spool1_depth+spool2_depth)/2;
+spool4_depth=depth*0.16;
+main_spools_x=width * 0.45;
+aux_spools_right_x=main_spools_x + spool_outer_radius + 1;
+aux_spools_left_x=main_spools_x - 13;
+middle_spool_in_r=2;
+middle_spool_out_r=7;
+aux_spool_plate_hole_inner_rim=2;
+aux_spool_plate_hole_outer_rim=2;
+spindle_diam=2;
+spindle_diam_tolerance=0.2;
+tape_z=plate+spool_plate_height;
+
+// dependency: https://github.com/revarbat/BOSL
+use <BOSL/transforms.scad>
+use <BOSL/metric_screws.scad>
+use <BOSL/masks.scad>
+
+include <holodisk.scad>
+include <reader.scad>
diff --git a/holodisk.scad b/holodisk.scad
new file mode 100755
index 0000000..4157fc8
--- /dev/null
+++ b/holodisk.scad
@@ -0,0 +1,188 @@
+// dependency: https://github.com/revarbat/BOSL
+use <BOSL/transforms.scad>
+use <BOSL/metric_screws.scad>
+use <BOSL/masks.scad>
+
+include <tape.scad>
+
+module frame() {
+    tr=top_rim;
+    tc=tr*1.5;
+    fbd=front_body_depth;
+    bbr=back_bumpers_radius;
+    
+    module back_bumpers() {
+        module bumper() { back_half() circle(r=bbr); }
+        back(depth) {
+            right(bbr) bumper();
+            right(width-bbr) bumper();
+        }
+    }
+    
+    module bolt() { metric_bolt(size=back_bumpers_bolt_size, headtype=bolt_headtype, l=height, pitch=0); }
+        module nut() { metric_nut(size=back_bumpers_bolt_size, pitch=0); }
+        
+    module back_bolts() {
+        back(depth) {
+            right(bbr) {
+                up(height) bolt();
+                nut();
+            }
+            right(width-bbr) {
+                up(height) bolt();
+                nut();
+            }
+        }
+    }
+    
+    module front_bolts() { 
+        bolt_offset=front_body_bolt_offset;
+        back(front_body_depth/2) {
+            right(bolt_offset) {
+                up(height) bolt();
+                nut();
+            }
+            right(width-bolt_offset) {
+                up(height) bolt();
+                nut();
+            }
+        }
+    }
+
+    module top_cover() {
+      up(height-plate) linear_extrude(height=plate) {
+        back_bumpers();
+        polygon(points=[
+                // frame
+                [0, 0], [0, depth],
+                [width, depth], [width, 0],
+                // window
+                [tr, tr+fbd], [tr, depth-tr-tc], [tr+tc, depth-tr],
+                [width-tr-tc, depth-tr], [width-tr, depth-tr-tc], [width-tr, tr+fbd]
+            ],
+            paths=[
+                [0,1,2,3], [4,5,6,7,8,9]
+            ]);
+        }
+    }
+    
+    module walls() {
+        walls_height=height-plate*2;
+        up(plate) linear_extrude(height=walls_height) {
+            //back_bumpers();
+            shell2d(thickness=-wall) {
+                square([width, depth]);
+            }
+        }
+    }
+    
+    module bottom_cover() {
+        linear_extrude(height=plate) {
+            back_bumpers();
+            square([width, depth]);
+        }
+    }
+    
+    color("SaddleBrown") top_cover();
+    color("grey") walls();
+    color("SaddleBrown") bottom_cover();
+    color("silver") back_bolts();
+    color("silver") front_bolts();
+}
+
+module mechanism() {
+    module spool(r_in, r_out, in_rim, out_rim) {
+        module spindle(d, h) {
+            color("Sienna") cylinder(h=h, d=d);
+        }
+            
+        module spool_plate() {
+            difference() {
+                cylinder(h=spool_plate_height, r=r_out);
+                if (!$preview && r_out - r_in > out_rim) {
+                    angle=spool_plate_hole_angle;
+                    difference() {
+                        for (i = [1:spool_plate_holes]) {
+                            zrot(360/spool_plate_holes * i) {
+                                angle_pie_mask(r=r_out - out_rim, l=spool_plate_height, ang=angle, center=false);
+                            }
+                        }
+                        cylinder(h=spool_plate_height, r=r_in + in_rim);
+                    }
+                }
+            }
+        }
+        
+        spindle_h=height-plate;
+        difference() {
+            color("Azure") {
+                spool_plate();
+                up(spool_plate_height) cylinder(h=spool_inner_height, r=r_in);
+                up(spool_plate_height + spool_inner_height) spool_plate();
+            }
+            up(spool_plate_height + spool_inner_height/2) cube([r_in*2, spool_slit_depth, spool_inner_height], center=true);
+            // TODO: spindle height
+            spindle(d=spindle_diam+spindle_diam_tolerance, h=spindle_h);
+        }
+        spindle(d=spindle_diam, h=spindle_h);
+    }
+    
+    module main_spool() {
+        spool(r_in=spool_inner_radius,
+            r_out=spool_outer_radius,
+            in_rim=spool_plate_hole_inner_rim,
+            out_rim=spool_plate_hole_outer_rim);
+    }
+    module aux_spool() {
+        spool(r_in=middle_spool_in_r, r_out=middle_spool_out_r,
+            in_rim=aux_spool_plate_hole_inner_rim,
+            out_rim=aux_spool_plate_hole_outer_rim);
+    }
+    
+    module spools() {
+        up(plate) {
+            right(main_spools_x) {
+                back(spool1_depth) main_spool();
+                back(spool2_depth) main_spool();
+            }
+            right(aux_spools_right_x) {
+                back(spool3_depth) aux_spool();
+                back(spool4_depth) aux_spool();
+            }
+            right(aux_spools_left_x) {
+                back(spool4_depth) aux_spool();
+            }
+        }
+    }
+    
+    module tapes() {
+        spool1_tape_r = spool_outer_radius * 0.8;
+        spool2_tape_r = spool_outer_radius * 0.5;
+        up(plate + spool_plate_height) {
+            // main spools
+            right(main_spools_x) {
+               back(spool1_depth) tape_spool(r_in=spool_inner_radius, r_out=spool1_tape_r);
+               back(spool2_depth) tape_spool(r_in=spool_inner_radius, r_out=spool2_tape_r);
+            }
+            // TODO: convert to path
+            // main 1 --> middle
+            tape([main_spools_x + spool1_tape_r, spool1_depth, 0], [aux_spools_right_x + middle_spool_in_r, spool3_depth, 0]);
+            // --> right corner
+            right(aux_spools_right_x + middle_spool_in_r) tape([0, spool3_depth, 0], [0, spool4_depth, 0]);
+            // --> left corner
+            tape([aux_spools_left_x, spool4_depth - middle_spool_in_r, 0], [aux_spools_right_x, spool4_depth - middle_spool_in_r, 0]);
+            // --> main 2
+            tape([aux_spools_left_x - middle_spool_in_r, spool4_depth, 0], [main_spools_x - spool2_tape_r, spool2_depth, 0]);
+        }
+    }
+    
+    spools();
+    tapes();
+}
+
+module holodisk() {
+    #frame();
+    mechanism();
+}
+
+holodisk();
diff --git a/reader.scad b/reader.scad
new file mode 100755
index 0000000..7e81853
--- /dev/null
+++ b/reader.scad
@@ -0,0 +1,82 @@
+// dependency: https://github.com/revarbat/BOSL
+use <BOSL/transforms.scad>
+
+// outside config
+width=60;
+height=15;
+depth=100;
+tape_height=5;
+tape_z=4;
+
+// local config
+frame=5;
+head_frame=2;
+head_size=[14, 10, tape_height+head_frame*2];
+head_pos=[width/2, -frame+2, tape_z-head_frame];
+laser_size=[10, 2, tape_height];
+laser_pos=[head_pos.x, head_pos.y + 10 + head_size.y, tape_z];
+laser_tower_size=[laser_size.x+2, laser_size.y+1, 15];
+
+module reader() {
+    module laser(corner=0.1) {
+        up(laser_size.z/2)
+        up(corner)
+        color("Red")
+        minkowski() {
+            s=[laser_size.x, laser_size.y, laser_size.z-corner*2];
+            cube(s, center=true);
+            sphere(corner);
+        }
+    }
+    
+    module laser_tower(corner=2) {
+        color("DarkSlateBlue")
+        back(laser_tower_size.y-laser_size.y)
+        difference() {
+            minkowski() {
+                s=[laser_tower_size.x, laser_tower_size.y, laser_tower_size.z-corner*2];
+                up(laser_size.z/2)
+                cube(s, center=true);
+                sphere(corner);
+            }
+            fwd(laser_tower_size.y) scale(1.05) laser();
+        }
+    }
+    
+    module head_space() {
+        stube=[head_size.x-head_frame*2, head_size.y+head_frame*3, head_size.z-head_frame*2];
+        up(head_size.z/4 + head_frame)
+            cube(stube, center=true);
+    }
+    
+    module head(corner=0.5) {
+        up(corner)
+        back(head_size.y/2)
+        color("DarkSlateBlue")
+        minkowski() {
+            s=[head_size[0], head_size[1] + frame, head_size[2]-corner*2];
+            
+            difference() {
+                up(head_size.z/2) cube(s, center=true);
+                head_space();
+            }
+            sphere(corner);
+        }
+    }
+   
+    translate(head_pos) head();
+    translate(laser_pos) {
+        laser();
+        laser_tower();
+    }
+    
+    color("DarkSlateBlue") {
+        difference() {
+            fwd(frame) cube([width, frame, height]);
+            translate(head_pos) head_space();
+        }
+        fwd(frame) down(frame) cube([width, depth + frame, frame]);
+    }
+}
+
+reader();
diff --git a/tape.scad b/tape.scad
new file mode 100755
index 0000000..cb821f3
--- /dev/null
+++ b/tape.scad
@@ -0,0 +1,25 @@
+// dependency: https://github.com/revarbat/BOSL
+use <BOSL/transforms.scad>
+
+module tape(start, end, height = tape_height, thickness = tape_thickness) {
+    color("RosyBrown")
+    up(thickness) hull() {
+        translate(start) sphere(thickness);
+        translate(end) sphere(thickness);
+        up(height - thickness) {
+            translate(start) sphere(thickness);
+            translate(end) sphere(thickness);
+        }
+    }
+}
+
+module tape_spool(r_in, r_out, height = tape_height, thickness = tape_thickness) {
+    color("RosyBrown")
+    up(thickness) minkowski() {
+        difference() {
+            cylinder(h=height - thickness, r=r_out);
+            cylinder(h=height - thickness, r=r_in);
+        }
+        sphere(thickness);
+    }
+}