diff --git a/prototype/circles.py b/prototype/circles.py
index 625a3ca..3d6414f 100644
--- a/prototype/circles.py
+++ b/prototype/circles.py
@@ -184,6 +184,7 @@ class PlateLayout:
 
         # parameters for dispenser gears
         self.dispenser_module = 1.0
+        plate_height = 8.0
         dispenser_1_target_pitch_diameter_big = 50.0
         dispenser_1_target_pitch_diameter_small = 15.0
         dispenser_1_teeth_big = int(dispenser_1_target_pitch_diameter_big/self.dispenser_module)
@@ -259,7 +260,8 @@ class PlateLayout:
         p2 = dispenser_1_pitch_diameter_small
         a1 = self.dispenser_module
         a2 = self.dispenser_module
-        offset_1 = sqrt((p1 / 2 + p2 / 2) ** 2 - (p1 / 2 + a1) ** 2) - p2 / 2 - a2
+        h = plate_height/2.0
+        offset_1 = sqrt((p1 / 2 + p2 / 2) ** 2 - (p1 / 2 + a1 + h) ** 2) - p2 / 2 - a2
         print("dispenser 1 offset = {}".format(offset_1))
 
         print(" big circle tangent points: ")
@@ -321,7 +323,7 @@ class PlateLayout:
         p2 = dispenser_2_pitch_diameter_small
         a1 = self.dispenser_module
         a2 = self.dispenser_module
-        offset_2 = sqrt((p1 / 2 + p2 / 2) ** 2 - (p1 / 2 + a1) ** 2) - p2 / 2 - a2
+        offset_2 = sqrt((p1 / 2 + p2 / 2) ** 2 - (p1 / 2 + a1 + h) ** 2) - p2 / 2 - a2
         print("dispenser 2 offset = {}".format(offset_2))
 
         print(" small circle tangent points: ")
diff --git a/prototype/dispenser_gears.svg b/prototype/dispenser_gears.svg
index 5d752dc..7794143 100644
--- a/prototype/dispenser_gears.svg
+++ b/prototype/dispenser_gears.svg
@@ -9,7 +9,7 @@
    xmlns="http://www.w3.org/2000/svg"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   sodipodi:docname="feeder_gears.svg"
+   sodipodi:docname="dispenser_gears.svg"
    width="210mm"
    height="297mm"
    viewBox="0 0 744.09448819 1052.3622047"
@@ -23,17 +23,17 @@
      borderopacity="1.0"
      inkscape:pageopacity="0.0"
      inkscape:pageshadow="2"
-     inkscape:zoom="1.8101934"
-     inkscape:cx="196.01806"
-     inkscape:cy="474.03501"
+     inkscape:zoom="2.5600001"
+     inkscape:cx="116.84746"
+     inkscape:cy="648.90954"
      inkscape:document-units="mm"
      inkscape:current-layer="svg2"
      showgrid="false"
-     inkscape:window-width="960"
-     inkscape:window-height="1028"
-     inkscape:window-x="960"
+     inkscape:window-width="1920"
+     inkscape:window-height="1056"
+     inkscape:window-x="0"
      inkscape:window-y="24"
-     inkscape:window-maximized="0" />
+     inkscape:window-maximized="1" />
   <defs
      id="defs4" />
   <metadata
@@ -72,7 +72,7 @@
   </g>
   <g
      info="N:16; Pitch:22.2632550254; Pressure Angle: 20.0"
-     transform="matrix(0.98261279,-0.18566662,0.18566662,0.98261279,416.37006,413.37433)"
+     transform="matrix(0.99144484,0.13052619,-0.13052619,0.99144484,402.83559,425.52773)"
      inkscape:label="Gear16"
      id="g4161">
     <path
@@ -89,38 +89,38 @@
        id="circle4165" />
   </g>
   <path
-     style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.81840914px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     d="m 208.00782,413.69031 139.45312,0"
+     style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1.18522573px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+     d="m 208.00782,413.69031 292.47544,0"
      id="path4205"
      inkscape:connector-curvature="0" />
   <path
-     style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     d="m 296.28906,412.90906 c 0.39063,-120.50782 0.39063,-120.50782 0.39063,-120.50782 C 417.1875,413.29968 417.1875,413.29968 417.1875,413.29968"
+     style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.9883278px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+     d="M 295.9019,425.20469 C 296.24829,292.4573 296.24829,292.4573 296.24829,292.4573 403.10616,425.63498 403.10616,425.63498 403.10616,425.63498"
      id="path4212"
      inkscape:connector-curvature="0" />
   <text
      xml:space="preserve"
      style="font-style:normal;font-weight:normal;font-size:40px;line-height:125%;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     x="322.07031"
-     y="310.56531"
+     x="325.39062"
+     y="320.33093"
      id="text4214"
      sodipodi:linespacing="125%"><tspan
        sodipodi:role="line"
        id="tspan4216"
-       x="322.07031"
-       y="310.56531"
+       x="325.39062"
+       y="320.33093"
        style="font-size:6.25px">p1/2</tspan></text>
   <text
      xml:space="preserve"
      style="font-style:normal;font-weight:normal;font-size:40px;line-height:125%;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     x="391.20636"
-     y="384.9657"
+     x="385.5423"
+     y="393.36414"
      id="text4214-3"
      sodipodi:linespacing="125%"><tspan
        sodipodi:role="line"
        id="tspan4216-6"
-       x="391.20636"
-       y="384.9657"
+       x="385.5423"
+       y="393.36414"
        style="font-size:6.25px">p2/2</tspan></text>
   <text
      xml:space="preserve"
@@ -133,7 +133,7 @@
        x="228.71094"
        y="324.62781"
        style="font-size:6.25px"
-       id="tspan4246"> p1/2 + a1</tspan><tspan
+       id="tspan4246"> p1/2 + a1 + h</tspan><tspan
        sodipodi:role="line"
        x="228.71094"
        y="332.44031"
@@ -141,27 +141,27 @@
        id="tspan4248">(= Outside circle)</tspan></text>
   <path
      style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     d="m 351.95313,417.20593 c 0,4.10157 0,4.10157 0,4.10157"
+     d="m 338.67188,428.53405 c 0,4.10157 0,4.10157 0,4.10157"
      id="path4252"
      inkscape:connector-curvature="0" />
   <path
-     style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.96795285px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     d="m 295.70311,419.35437 122.05746,0"
+     style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.90801376px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+     d="m 294.87447,430.40291 107.40902,0"
      id="path4254"
      inkscape:connector-curvature="0" />
   <path
      style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     d="m 375.58594,373.45593 c 4.88281,-3.71094 4.88281,-3.71094 4.88281,-3.71094"
+     d="m 364.84375,383.41687 c 4.88281,-3.71094 4.88281,-3.71094 4.88281,-3.71094"
      id="path4258"
      inkscape:connector-curvature="0" />
   <path
      style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     d="m 294.92188,292.01062 c 3.51562,-2.14844 3.51562,-2.14844 3.51562,-2.14844"
+     d="m 293.95513,292.83926 c 3.51562,-2.14844 3.51562,-2.14844 3.51562,-2.14844"
      id="path4260"
      inkscape:connector-curvature="0" />
   <path
      style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     d="m 415.18699,415.16107 c 4.29687,-3.51562 4.29687,-3.51562 4.29687,-3.51562"
+     d="m 401.12449,427.46576 c 4.29687,-3.51562 4.29687,-3.51562 4.29687,-3.51562"
      id="path4262"
      inkscape:connector-curvature="0" />
   <flowRoot
@@ -187,41 +187,41 @@
          x="51.5625"
          y="596.11218"
          style="font-size:6.25px" /></flowRegion><flowPara
-       id="flowPara4278">(p1/2 + p2/2)**2 = (p1/2 + a1)**2 + (p2/2 + a2 + x)**2</flowPara><flowPara
+       id="flowPara4278">(p1/2 + p2/2)**2 = (p1/2 + a1 + h)**2 + (p2/2 + a2 + x)**2</flowPara><flowPara
        id="flowPara4374" /><flowPara
        id="flowPara4372">    =&gt; Offset x = sqrt((p1/2 + p2/2)**2 - (p1/2 + a1)**2) - p2/2 - a2</flowPara></flowRoot>  <text
      xml:space="preserve"
      style="font-style:normal;font-weight:normal;font-size:40px;line-height:125%;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     x="324.21875"
-     y="428.14343"
+     x="323.4375"
+     y="435.37"
      id="text4296"
      sodipodi:linespacing="125%"><tspan
        sodipodi:role="line"
        id="tspan4298"
-       x="324.21875"
-       y="428.14343"
+       x="323.4375"
+       y="435.37"
        style="font-size:6.25px">x</tspan></text>
   <path
      style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     d="m 295.70313,417.49892 c 0,4.10157 0,4.10157 0,4.10157"
+     d="m 295.50782,427.91413 c 0,4.10157 0,4.10157 0,4.10157"
      id="path4252-7"
      inkscape:connector-curvature="0" />
   <path
      style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     d="m 417.77344,417.10829 c 0,4.10157 0,4.10157 0,4.10157"
+     d="m 402.92969,427.45985 c 0,4.10157 0,4.10157 0,4.10157"
      id="path4252-5"
      inkscape:connector-curvature="0" />
   <text
      xml:space="preserve"
      style="font-style:normal;font-weight:normal;font-size:40px;line-height:125%;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
-     x="373.82812"
-     y="427.36218"
+     x="355.07812"
+     y="435.56531"
      id="text4321"
      sodipodi:linespacing="125%"><tspan
        sodipodi:role="line"
        id="tspan4323"
-       x="373.82812"
-       y="427.36218"
+       x="355.07812"
+       y="435.56531"
        style="font-size:6.25px">p2/2 + a2</tspan></text>
   <flowRoot
      xml:space="preserve"
@@ -239,7 +239,8 @@
        id="flowPara4333">p2: Pitch diameter gear 2</flowPara><flowPara
        id="flowPara4335">a1: Addendum gear 1 = module 1</flowPara><flowPara
        id="flowPara4337">a2: Addendum gear 2 = module 2</flowPara><flowPara
-       id="flowPara4376">x  : Offset</flowPara></flowRoot>  <flowRoot
+       id="flowPara4376">x  : Offset</flowPara><flowPara
+       id="flowPara4212">h  : half of the plate height</flowPara></flowRoot>  <flowRoot
      xml:space="preserve"
      id="flowRoot4360"
      style="font-style:normal;font-weight:normal;font-size:40px;line-height:125%;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"><flowRegion
@@ -305,7 +306,7 @@
   </g>
   <g
      info="N:53; Pitch:16.6974412691; Pressure Angle: 25.0"
-     transform="translate(224.50825,840.97022)"
+     transform="translate(147.94575,906.59522)"
      inkscape:label="Gear53"
      inkscape:transform-center-x="-0.086406844"
      id="g6277">
@@ -412,4 +413,19 @@
        x="0"
        style="font-style:normal;font-weight:normal;font-size:13px;font-family:'Bitstream Vera Sans', sans-serif;text-align:center;text-anchor:middle;fill:#f6921e">Base diameter: 35.346 mm</text>
   </g>
+  <path
+     inkscape:connector-curvature="0"
+     id="path4208"
+     d="m 206.90296,426.67235 292.47544,0"
+     style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1.18346453;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:1.18346453, 2.36692905;stroke-dashoffset:0;stroke-opacity:1" />
+  <path
+     inkscape:connector-curvature="0"
+     id="path4210"
+     d="m 207.45539,438.54953 292.47544,0"
+     style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1.18522573px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" />
+  <path
+     style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+     d="m 298.1593,425.68469 c -4.10157,0 -4.10157,0 -4.10157,0"
+     id="path4252-3"
+     inkscape:connector-curvature="0" />
 </svg>
diff --git a/prototype/notes.txt b/prototype/notes.txt
index 2d6f546..f96c031 100644
--- a/prototype/notes.txt
+++ b/prototype/notes.txt
@@ -8,11 +8,15 @@ Lasercut segments for plate. Profile: FLB_Sperrholz_4mm_Natur_new
 Important: SVG produced by python script needs to be openend, transformed and saved in inkscape, otherwise import in CorelDraw fails
 
 In progress:
-- automate generation of plate segment
+
 
 TODO: 
-- stack 2 plates for better stability (add cuts at small circles)
 - second ring above the first plate to fix the containers and hide the gear mechanic (or manufacure them from acrylic to show the mechanic)
-- think about if stacked plate is to thick for a single gear (i.e. we may need two gears in order to transfer motion from below the plate to dispensers)
+- whole for hinges of big dispenser gears
 - shovels for dispensers by cutting segments from a sphere
+
+DONE:
+- stack 2 plates for better stability (add cuts at small circles)
+- automate generation of plate segment
 - connectors for segments (jigsaw puzzle style)
+- think about if stacked plate is to thick for a single gear (i.e. we may need two gears in order to transfer motion from below the plate to dispensers) -> solved by moving hinge point of the gear in between the two plates