The project enabled the group to learn various lessons about design theory and practicality. Based on these experiences, the following conclusions are the most prominent:
1) Pay attention to the proper use of fasteners: The group was successful in implementing retaining rings on the Design I and Design II prototype. The pin joints connecting most of the links of the four bar linkage was fixed in place with these rings. However, the fact that these mechanical components were designed to rest in a groove on the pin was ignored. Without a groove, it was very difficult to assemble the joints of our four bar linkage since the ring had to be bent to accommodate a slightly larger diameter. The retaining ring functioned well once in place, but the appropriate groove would need to be added if the product was to be mass produced for ease of assembly.
2) Identify Manufacturing Limitations: The group initially faced problems with quality of 3D-printed parts. Holes were consistently undersized and the group found it necessary to perform a calibration print to determine proper offsets for hole sizes. Other calibrations were necessary to select an appropriate temperature, print-speed, and layer thickness. Once these machine settings were determined the team saved them and consistently used the same printer and the same spool of plastic to print parts. While calibration was a time consuming process, it was a necessary step for producing FDM printed parts with consistent, high quality features and finishes.
3) Understand Customer Needs and Check-In Frequently: