diff --git a/holodisk.scad b/holodisk.scad
index 882f490..3cf62bf 100755
--- a/holodisk.scad
+++ b/holodisk.scad
@@ -11,266 +11,41 @@ use <tape_spool.scad>
 
 disk_size = get_holodisk_size();
 holodisk_size = get_holodisk_size();
-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=disk_size.y*0.77;
-spool2_depth=disk_size.y*0.40;
-spool3_depth=(spool1_depth+spool2_depth)/2;
-spool4_depth=disk_size.y*0.16;
-main_spools_x=disk_size.x*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;
 
-module frame(size) {
-    width=size.x;
-    depth=size.y;
-    height=size.z;
-    
-    tr=top_rim;
-    tc=tr*1.5;
-    fbd=front_body_depth;
-    bbr=back_bumpers_radius;
-    
-    walls_height=height-plate*2;
-    
-    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();
-            }
-        }
-    }
+use <holodisk_frame.scad>
 
-    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() {
-        difference() {
-            up(plate) linear_extrude(height=walls_height) {
-                //back_bumpers();
-                shell2d(thickness=-wall) {
-                    square([width, depth]);
-                }
-            }
-            translate(get_holodisk_laserwindow_pos_center()) cube(get_holodisk_laserwindow_size(), center=true);
-        }
-    }
-    
-    module front_plates() {
-        th = get_holodisk_front_plate_thickness();
-        slide_pos = get_holodisk_slide_pos();
-        offset=4.5;
-        plate_len_side=slide_pos.y - offset/2;
-        plate_len_left=plate_len_side/2;
-        plate_len_right=plate_len_side + 5;
-        // front
-        fwd(th) left(th) up(offset) {
-            cube([plate_len_left + th*2, th, height - offset*2]);
-        }
-        fwd(th) right(width-plate_len_right-th) up(offset) {
-            cube([plate_len_right + th*2, th, height - offset*2]);
-        }
-        // left
-        fwd(th) left(th) up(offset) {
-            cube([th, plate_len_side, height - offset*2]);
-        }
-        // right
-        fwd(th) right(width) up(offset) {
-            cube([th, plate_len_side, height - offset*2]);
-        }
-    }
-    
-    module slides() {
-        slide_size = get_holodisk_slide_size();
-            slide_pos = get_holodisk_slide_pos();
-            slide_plate_size = [0.1, slide_size.y, slide_size.z]; 
-            sliding_size = get_holodisk_slide_sliding_size();
-            sliding_pos = get_holodisk_slide_sliding_pos();
-        
-        module slide() {
-            hull() {
-                translate(sliding_pos) cube(sliding_size);
-                translate(slide_pos) cube(slide_plate_size);
-            }
-        }
-        
-        module slider() {
-            slider_size = get_holodisk_slide_slider_size();
-            slider_pos = get_holodisk_slide_slider_pos();
-            slider_plate_size = [0.1, slider_size.y, slider_size.z]; 
-            slider_top_size = [slider_size.x, slider_size.y, sliding_size.z]; 
-            hull() {
-                up((slider_size.z-sliding_size.z)/2) translate(slider_pos) cube(slider_top_size);
-                translate(slider_pos) cube(slider_plate_size);
-            }
-        }
-            
-        right(get_holodisk_size().x) {
-           slide();
-           slider();
-        }
-        scale([-1,1,1]) {
-            slide();
-            slider();
-        }
-        
-        right(get_holodisk_laserwindow_pos_center().x) zrot(-90) {
-           scale([1, 0.7, 1]) {
-              slider();
-           }
-        }
-    }
-    
-    module laserwindow_door() {
-        door_size = [
-            get_holodisk_laserwindow_size().x,
-            1,
-            get_holodisk_laserwindow_size().z
-        ];
-        door_pos = [
-            get_holodisk_laserwindow_pos_center().x,
-            get_holodisk_laserwindow_pos_center().y + door_size.y/2,
-            get_holodisk_laserwindow_pos_center().z
-        ];
-        
-        translate(door_pos) scale(0.98) down(door_size.z/2) xrot(anim(1,2)*-90) xrot(anim(6,7)*90) up(door_size.z/2) cube(door_size, center=true);
-    }
-    
-    module bottom_cover() {
-        difference() {
-            linear_extrude(height=plate) {
-                back_bumpers();
-                square([width, depth]);
-            }
-            down(0.1) translate(get_holodisk_laser_cutout_pos()) cube(get_holodisk_laser_cutout_size());
-        }
-    }
-    
-    {
-        overlap=1;
-        rails_size = [
-            get_holodisk_laserwindow_size().x * 2 + overlap*2,
-            1,
-            walls_height
-        ];
-        rail_size = [rails_size.x, rails_size.y, 2];
-        rails_pos = [get_holodisk_laserwindow_pos().x - rails_size.x/2,
-            -rails_size.y, plate];
-        rail1_pos = [rails_pos.x, rails_pos.y, rails_pos.z];
-        rail2_pos = [rails_pos.x, rails_pos.y, rails_pos.z + rails_size.z - rail_size.z];
-        
-        module laserwindow_slider_rails() {
-            translate(rail1_pos) cube(rail_size);
-            translate(rail2_pos) cube(rail_size);
-        }
-    
-        module laserwindow_slider_cover() {
-            cover_size=[
-                get_holodisk_laserwindow_size().x,
-                get_holodisk_slide_slider_size().x,
-                get_holodisk_slide_slider_size().z
-            ];
-            cover_plate=[cover_size.x, rail_size.y, cover_size.z];
-            cover_top=[cover_size.x - overlap, cover_size.y, cover_size.z - overlap];
-            /*cover_pos=[rails_pos.x+overlap, rails_pos.y + rails_size.y, rails_pos.z];*/
-            cover_pos=[get_holodisk_laserwindow_pos().x, rails_pos.y + rails_size.y, rails_pos.z];
-            left(anim(0,1)*get_holodisk_laserwindow_size().x)
-            right(anim(len(get_anim_keys())-2,len(get_anim_keys())-1)*get_holodisk_laserwindow_size().x)
-            translate(cover_pos)
-            hull() {
-                fwd(cover_plate.y) cube(cover_plate);
-                right(overlap/2) fwd(cover_top.y) up((cover_plate.z-cover_top.z)/2) cube(cover_top);
-            }
-        }
-        
-        color("red") laserwindow_slider_rails();
-        color("red") laserwindow_slider_cover();
-    }
-    
-    color("SaddleBrown") top_cover();
-    color("grey") walls();
-    color("gold") laserwindow_door();
-    color("Silver") slides();
-    color("SaddleBrown") bottom_cover();
-    color("SaddleBrown") front_plates();
-    //color("silver") back_bolts();
-    //color("silver") front_bolts();
-}
-
-module mechanism(size) {
+module holodisk_mechanism() {
+    size=get_holodisk_size();
     width=size.x;
     depth=size.y;
     height=size.z;
     
+    plate=get_holodisk_bottom_thickness();
+    tape_height=get_holodisk_tape_height();
+    tape_thickness=get_holodisk_tape_thickness();
+    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_inner_rim=1;
+    spool_plate_hole_outer_rim=4;
+    spool1_depth=disk_size.y*0.77;
+    spool2_depth=disk_size.y*0.40;
+    spool3_depth=(spool1_depth+spool2_depth)/2;
+    spool4_depth=disk_size.y*0.16;
+    main_spools_x=disk_size.x*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;
+    
     module main_spool() {
         spool(r_in=spool_inner_radius,
             r_out=spool_outer_radius,
@@ -327,12 +102,13 @@ module mechanism(size) {
     tapes();
 }
 
-module holodisk(size) {
-    frame(size);
-    mechanism(size);
+module holodisk() {
+    holodisk_frame();
+    holodisk_mechanism();
 }
 
-retraction=holodisk_size.y+10;
+// test
+retraction=get_holodisk_size().y+10;
 back((1-anim(1, 2)) * retraction) // anim insert
 back((anim(len(get_anim_keys())-2, len(get_anim_keys())-1)) * retraction) // anim remove
-holodisk(holodisk_size);
+holodisk();
diff --git a/holodisk_frame.scad b/holodisk_frame.scad
new file mode 100644
index 0000000..6106308
--- /dev/null
+++ b/holodisk_frame.scad
@@ -0,0 +1,268 @@
+// dependency: https://github.com/revarbat/BOSL
+use <BOSL/transforms.scad>
+//use <BOSL/metric_screws.scad>
+use <BOSL/masks.scad>
+
+use <holodisk_spec.scad>
+use <anim.scad>
+
+module holodisk_frame() {
+    size = get_holodisk_size();
+    disk_size = get_holodisk_size();
+    holodisk_size = get_holodisk_size();
+    width=size.x;
+    depth=size.y;
+    height=size.z;
+    
+    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=disk_size.y*0.77;
+    spool2_depth=disk_size.y*0.40;
+    spool3_depth=(spool1_depth+spool2_depth)/2;
+    spool4_depth=disk_size.y*0.16;
+    main_spools_x=disk_size.x*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;
+    
+    tr=top_rim;
+    tc=tr*1.5;
+    fbd=front_body_depth;
+    bbr=back_bumpers_radius;
+    
+    walls_height=height-plate*2;
+    
+    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() {
+        difference() {
+            up(plate) linear_extrude(height=walls_height) {
+                //back_bumpers();
+                shell2d(thickness=-wall) {
+                    square([width, depth]);
+                }
+            }
+            translate(get_holodisk_laserwindow_pos_center()) cube(get_holodisk_laserwindow_size(), center=true);
+        }
+    }
+    
+    module front_plates() {
+        th = get_holodisk_front_plate_thickness();
+        slide_pos = get_holodisk_slide_pos();
+        offset=4.5;
+        plate_len_side=slide_pos.y - offset/2;
+        plate_len_left=plate_len_side/2;
+        plate_len_right=plate_len_side + 5;
+        // front
+        fwd(th) left(th) up(offset) {
+            cube([plate_len_left + th*2, th, height - offset*2]);
+        }
+        fwd(th) right(width-plate_len_right-th) up(offset) {
+            cube([plate_len_right + th*2, th, height - offset*2]);
+        }
+        // left
+        fwd(th) left(th) up(offset) {
+            cube([th, plate_len_side, height - offset*2]);
+        }
+        // right
+        fwd(th) right(width) up(offset) {
+            cube([th, plate_len_side, height - offset*2]);
+        }
+    }
+    
+    module slides() {
+        slide_size = get_holodisk_slide_size();
+            slide_pos = get_holodisk_slide_pos();
+            slide_plate_size = [0.1, slide_size.y, slide_size.z]; 
+            sliding_size = get_holodisk_slide_sliding_size();
+            sliding_pos = get_holodisk_slide_sliding_pos();
+        
+        module slide() {
+            hull() {
+                translate(sliding_pos) cube(sliding_size);
+                translate(slide_pos) cube(slide_plate_size);
+            }
+        }
+        
+        module slider() {
+            slider_size = get_holodisk_slide_slider_size();
+            slider_pos = get_holodisk_slide_slider_pos();
+            slider_plate_size = [0.1, slider_size.y, slider_size.z]; 
+            slider_top_size = [slider_size.x, slider_size.y, sliding_size.z]; 
+            hull() {
+                up((slider_size.z-sliding_size.z)/2) translate(slider_pos) cube(slider_top_size);
+                translate(slider_pos) cube(slider_plate_size);
+            }
+        }
+            
+        right(get_holodisk_size().x) {
+           slide();
+           slider();
+        }
+        scale([-1,1,1]) {
+            slide();
+            slider();
+        }
+        
+        right(get_holodisk_laserwindow_pos_center().x) zrot(-90) {
+           scale([1, 0.7, 1]) {
+              slider();
+           }
+        }
+    }
+    
+    module laserwindow_door() {
+        door_size = [
+            get_holodisk_laserwindow_size().x,
+            1,
+            get_holodisk_laserwindow_size().z
+        ];
+        door_pos = [
+            get_holodisk_laserwindow_pos_center().x,
+            get_holodisk_laserwindow_pos_center().y + door_size.y/2,
+            get_holodisk_laserwindow_pos_center().z
+        ];
+        
+        translate(door_pos) scale(0.98) down(door_size.z/2) xrot(anim(1,2)*-90) xrot(anim(6,7)*90) up(door_size.z/2) cube(door_size, center=true);
+    }
+    
+    module bottom_cover() {
+        difference() {
+            linear_extrude(height=plate) {
+                back_bumpers();
+                square([width, depth]);
+            }
+            down(0.1) translate(get_holodisk_laser_cutout_pos()) cube(get_holodisk_laser_cutout_size());
+        }
+    }
+    
+    {
+        overlap=1;
+        rails_size = [
+            get_holodisk_laserwindow_size().x * 2 + overlap*2,
+            1,
+            walls_height
+        ];
+        rail_size = [rails_size.x, rails_size.y, 2];
+        rails_pos = [get_holodisk_laserwindow_pos().x - rails_size.x/2,
+            -rails_size.y, plate];
+        rail1_pos = [rails_pos.x, rails_pos.y, rails_pos.z];
+        rail2_pos = [rails_pos.x, rails_pos.y, rails_pos.z + rails_size.z - rail_size.z];
+        
+        module laserwindow_slider_rails() {
+            translate(rail1_pos) cube(rail_size);
+            translate(rail2_pos) cube(rail_size);
+        }
+    
+        module laserwindow_slider_cover() {
+            cover_size=[
+                get_holodisk_laserwindow_size().x,
+                get_holodisk_slide_slider_size().x,
+                get_holodisk_slide_slider_size().z
+            ];
+            cover_plate=[cover_size.x, rail_size.y, cover_size.z];
+            cover_top=[cover_size.x - overlap, cover_size.y, cover_size.z - overlap];
+            /*cover_pos=[rails_pos.x+overlap, rails_pos.y + rails_size.y, rails_pos.z];*/
+            cover_pos=[get_holodisk_laserwindow_pos().x, rails_pos.y + rails_size.y, rails_pos.z];
+            left(anim(0,1)*get_holodisk_laserwindow_size().x)
+            right(anim(len(get_anim_keys())-2,len(get_anim_keys())-1)*get_holodisk_laserwindow_size().x)
+            translate(cover_pos)
+            hull() {
+                fwd(cover_plate.y) cube(cover_plate);
+                right(overlap/2) fwd(cover_top.y) up((cover_plate.z-cover_top.z)/2) cube(cover_top);
+            }
+        }
+        
+        color("red") laserwindow_slider_rails();
+        color("red") laserwindow_slider_cover();
+    }
+    
+    color("SaddleBrown") top_cover();
+    color("grey") walls();
+    color("gold") laserwindow_door();
+    color("Silver") slides();
+    color("SaddleBrown") bottom_cover();
+    color("SaddleBrown") front_plates();
+    //color("silver") back_bolts();
+    //color("silver") front_bolts();
+}
+
+// test
+holodisk_frame();
diff --git a/holodisk_spec.scad b/holodisk_spec.scad
index fcad369..ce40384 100644
--- a/holodisk_spec.scad
+++ b/holodisk_spec.scad
@@ -7,11 +7,14 @@
 
 function get_holodisk_size() = [55, 100, 16];
 
+function get_holodisk_bottom_thickness() = 3;
+
 function get_holodisk_front_plate_thickness() = 1;
 
 // -- tape --
 
 function get_holodisk_tape_height() = 5;
+function get_holodisk_tape_thickness() = 0.2;
 
 // -- slide --
 
diff --git a/tape.scad b/tape.scad
index cb821f3..4f626e7 100755
--- a/tape.scad
+++ b/tape.scad
@@ -1,7 +1,9 @@
 // dependency: https://github.com/revarbat/BOSL
 use <BOSL/transforms.scad>
 
-module tape(start, end, height = tape_height, thickness = tape_thickness) {
+use <holodisk_spec.scad>
+
+module tape(start, end, height = get_holodisk_tape_height(), thickness = get_holodisk_tape_thickness()) {
     color("RosyBrown")
     up(thickness) hull() {
         translate(start) sphere(thickness);
@@ -13,7 +15,7 @@ module tape(start, end, height = tape_height, thickness = tape_thickness) {
     }
 }
 
-module tape_spool(r_in, r_out, height = tape_height, thickness = tape_thickness) {
+module tape_spool(r_in, r_out, height = get_holodisk_tape_height(), thickness = get_holodisk_tape_thickness()) {
     color("RosyBrown")
     up(thickness) minkowski() {
         difference() {