Add system design validation section

content/case_experiment.tex

@@ -35,3 +35,6 @@ Splitting the initial design into features is done in the feature definition ste
 \section{Second Development Cycle}
 \input{content/case_experiment_scara.tex}
 
+\section{System Design Validation}
+\input{content/case_experiment_prototype.tex}
+

content/case_experiment_prototype.tex

@@ -0,0 +1,15 @@
+        Together with the physics model there will be a solid 3D CAD model.
+        The CAD model helps to check with dimensions and possible collisions of objects.
+        With a full dynamics model in 20-sim, the next step was to design the system in OpenSCAD.
+        Although 20-sim has a 3D editor, it is significantly easier to build components with OpenSCAD.
+        Furthermore, for prototyping the OpenSCAD objects can be exported for 3D printing.
+        The model made it possible to check component clearance and get an idea of size.
+        The model is shown in \autoref{fig:scad_carriage}.
+        \begin{figure}
+            \centering
+            \includegraphics[width=0.8\linewidth]{graphics/scad_carriage.png}
+            \caption{Rendered 3D model of the SCARA}
+            \label{fig:scad_carriage}
+        \end{figure}
+
+