mold injection can be an affordable way to mass produce but if the design is not well engineered you are out of luck.
Polymer is strong though but I think swash use some mild acetal.
I think the vise, specifically, should have been reinforced with either some internal metal part or made out of aluminum and mounted somehow.

I saw the machine at Tattoo Jam, it looks nice but it would been dope if it was made out of aluminum.