======Final Prototype======
Here is our final prototype based upon Speedy Capper D3. We made it separable in order to make it possible to insert a spring and push rod. In order to do this we split the piece into two and threaded them; such that, they may be screwed together. We are proud of this design because it eloquent to manufacture and use. It is just 4 parts which can be made quickly. Additionally, this model in particular is a recycled mystery plastic, and recycled polycarbonate. 

{{:start:classes:principlesofdesign:img_2102.jpg?600x800|}}

{{:start:classes:principlesofdesign:img_2103.jpg?800x600|}}

{{:start:classes:principlesofdesign:img_2104.jpg?600x800|}}

{{:start:classes:principlesofdesign:img_2105.jpg?600x800|}}