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The Geneva mechanism was not added to the final prototype due to friction concerns with both the mechanism itself and prismatic joint it introduced. This was also more of a quality of life inclusion rather than a necessary inclusion for our purpose.
Final Prototype
For the final prototype, we made our mechanism out of acrylic for friction reduction and aesthetics, and 1/4 inch, instead of 1/8 inch as our prototypes used, for stability. Most of the linkages from prototype 3 were also taken away in favor of just a linkage connecting from the existing long piece from prototype 2 to the base of the cup, where another cup holder with a smaller diameter was also introduced. This was because the other linkages, when added to the entire mechanism, were redundant and added weight. The slider was reintroduced despite the friction since we needed a way to reliably stop the motion of the cup from continuing forward past a certain point so that the linkages would not collapse the wrong way, making it impossible to reset properly without outside assistance. Rubber bands were also added between some of the linkages to solve torque issues that came with not using gears (since, after the initial proposal, we decided to stay away from gears).
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