Multimedia

We finally chose a snap fit design to provide a more secure fit for the lid without having such tight tolerances. The 2 indentations on each side are what fit over the lip of the lid and create a physical barrier that keeps the lid attached.

The bottom view shows the two 4 cm long channels within each undercut to provide air flow for the vacuum to better pull the plastic into them.

Another iteration of the same interference fit but in a square shape. The height of the ridge was reduced for a more successful vacuum mold and the size of the air vent holes were reduced. (Not to scale)

The corresponding square bowl mold to the lid. The "bowl" part of the model is so small to reduce time and weight when resin printing.

Based on a seemingly vacuum molded plastic takeout container, this lid and bowl design have a matching trapezoidal ridge around the edge that tightly fit together when vacuum molded. (Not modeled to scale in order to print on small resin printer)

The corresponding bowl mold that interlocks with the lid. Measurements of the ridge were designed to match exactly to see if that would create a proper fit. Similarly not to scale of life size bowl proportions.

Our first initial concept for a snap lock lid mold, based off of a plastic food storage container. 

Our second lid mold design, includes design considerations for vacuum molding like air vent holes and a 3° taper on the sides