The two component parts of the Ventz presentation prototype were made with polypropylene plastic and TPU plastic respectively. These parts did not easily assemble and dissemble, however, and it was discovered that the TPU plastic had a sure-hardness of 80 and was not malleable enough. This problem was addressed and the sure-hardness of the plastic lowered to 75 in the final manufacturing specification. It was also discovered that, when bent (as around a rider’s arm), the TPU component came away too easily from the polypropylene. This was rectified with CAD by extending the length of the plastic pads designed to hold the two components together.
Having found solutions to these problems, D2M was then able to produce a manufacturing specification, including 3D data and information on everything from materials and sure-hardness to the finish to be used for the plastic, enabling the start of production tooling.