When considering DFM for our parts, we made sure that:

There were no undercuts on the petals so that our molds could come apart cleanly

All surfaces of the core, besides those that are snap interfaces, were drafted so parts would not get stuck after injection molding

Stigma shaft are a standard hole size, hole for stigma on body was a standard dowel pin size

Hole on lily pad would be created via deep draw during thermoforming instead of drilling out a hole after the fact

Snap ring could cover the lily pad to remove extra post processing step of manually cutting out triangle

Because of varying wall thicknesses in our part, our snap ring experienced a lot of non-uniform shrinking: To combat this, we measured our preliminary injection molded parts and re-machined our molds based off of those shrinkages. We also increased the cooling time from 10 seconds to 30 to limit the amount of shrinking the part experiences even after leaving the mold.

To reduce the shrinkage in the stigma top, we added a curvature to the stigma mold so that it would shrink into a flat geometry.

The two processes that we found to not be capable, were for the snap diameters of the interface between the body and snap ring. This lack of capability in these two processes is a reason why we needed to take extra effort and steps while assembling the snap ring of our yo-yos.

In contrast to the snap fit diameters, both critical dimensions of the stigma and the critical triangle dimension of the petals were found to be capable. This was confirmed by the ease in which the slip fit between stigma and petals was assembled and the satisfying snap fit of the stigma into the body.