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\begin{flushleft}

\tablehead{}
\begin{supertabular}{|m{3.38376in}|m{3.38376in}|}
\hline
\bfseries Type of improvement &
\bfseries Example(s) from the RepRap case study\\\hline
Added functionality &
\liststyleLi
\begin{itemize}
\item The ability to remove material in addition to adding it. The
ability to mix multiple materials. Use of ceramics and pastes instead
of thermoplastics.\item Embedding wire and conductive materials.\item
Ability to combine additive and subtractive manufacturing
(Hydra-MMM)\end{itemize}
\\\hline
Improved existing functionality &
\liststyleLii
\begin{itemize}
\item Faster, more efficient, more detailed and/or stronger
output.\end{itemize}
\\\hline
Increased ease of assembly and use &
\liststyleLiii
\begin{itemize}
\item Many design improvements incorporated in the second version Mendel
over the older {\textquotesingle}Darwin{\textquotesingle} design.\item
Derivative designs such as Makerbot and Ultimaker
Protobox.\end{itemize}
\\\hline
Lower cost &
\liststyleLiv
\begin{itemize}
\item Design of an alternative belt drive mechanism.\item Allowing the
use of cheap skate bearings\end{itemize}
\\\hline
More suitable components (e.g. easier-to-acquire) &
\liststyleLv
\begin{itemize}
\item A drive system based on ubiquitous ball-chains as an alternative
to industrial timing belt and pulleys.\item The Sanguino was developed
as an alternative to the Arduino.\end{itemize}\\
\hline
\end{supertabular}
\begin{supertabular}{|m{3.38376in}|m{3.38376in}|}
\bfseries Type of improvement &
\bfseries Example(s) from the RepRap case study\\\hline
\\\hline
Specialization towards a certain application &
\liststyleLvi
\begin{itemize}
\item Digital pottery system\item Plant growth modeling
device\end{itemize}\\
\hline
Interoperability with other systems &
\liststyleLvii
\begin{itemize}
\item Compatibility with G-Code common in industrial CNC
installations.~\item Writing platform independent software.~\item
Adding USB interfaces and having the machine work independently reading from 
removable storage media.\end{itemize}
\\\hline
Improved design architecture (e.g. modularization, part consolidation) &
\liststyleLviii
\begin{itemize}
\item Adoption of industrial standards for NC-machine control.\item
Change from multiple independent microcontroller in a token ring to a
single master microcontroller architecture with an optional slave
extruder controller.\end{itemize}
\\\hline
Refining operating techniques &
\liststyleLix
\begin{itemize}
\item Sharing better settings for making parts easier to separate from
their support structure (if applicable)\end{itemize}
\\\hline
Improved sharing infrastructure &
\liststyleLx
\begin{itemize}
\item Thingiverse.com was developed as website to facilitate sharing of
digital designs for physical objects and currently hosts over 3000 user
contributed objects which include, documentation, discussions and the
data to manufacture them or make derivative designs.\item Adoption of
Wiki{\textquotesingle}s and blogs for knowledge sharing.\item Local
user groups\end{itemize}
\\\hline
\end{supertabular}
\end{flushleft}
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