diff --git a/catflap.scad b/catflap.scad
index 54197a1..fe32891 100644
--- a/catflap.scad
+++ b/catflap.scad
@@ -1,5 +1,61 @@
+door_thick = 50;
+flap_w = 150;
+flap_h = 150;
+flap_thick = 20;
+angle = 10;
+bearing_inner_dia = 5;
+bearing_outer_dia = 10;
+bearing_h = 5;
+silver = [0.7,0.7,0.7];
+red = [1,0,0];
+$fn = 32;
+ry = [0,90,0]; // rotate 90 deg around y
+raise_stopper = -1;
+gap = 1;
+
 module door(){
-    translate([-450,0,0])cube([900,50,2000]);
+    translate([-450,0,0])cube([900,door_thick,2000]);
+}
+
+module flap(){
+    difference(){
+        translate([flap_w,flap_thick,0]/-2)
+            cube([flap_w,flap_thick,flap_h]);
+        translate([2*(10+gap)+bearing_h,bearing_outer_dia+gap,2]/-2)
+            cube([bearing_h+2*(gap+10),bearing_outer_dia+gap,2*bearing_h+20+gap+1]);
+    }
+    translate([0,0,raise_stopper])stopper();
+}
+
+module bearing(){
+    color(silver)
+        rotate(ry)
+            difference(){
+                cylinder(d=bearing_outer_dia,h=bearing_h,center=true);
+                cylinder(d=bearing_inner_dia,h=bearing_h+2,center=true);
+            }
 }
 
-door();
\ No newline at end of file
+module bearing_case(){
+    rotate(ry)
+        cylinder(d=(bearing_inner_dia+gap)/2,h=bearing_h+gap);
+    translate([(bearing_h+gap)/2,0,bearing_inner_dia/2])
+        rotate(ry)
+            cylinder(d=bearing_outer_dia,h=10);
+    translate([(bearing_h+1)/2,-bearing_outer_dia/2,0])
+        cube([10,bearing_outer_dia,bearing_h+20]);
+    translate([0,bearing_outer_dia/-2,bearing_h+1])
+        cube([bearing_h,bearing_outer_dia,19]);
+}
+
+module stopper(){
+    color(red){
+        bearing_case();
+        rotate([0,0,180]) bearing_case();
+    }
+    bearing();
+}
+
+*door();
+flap();
+