Comment by buran77

I don't think that's it. You're referring to tolerances specified in the design. The article talks about the tolerances the manufacturing technique allows, and this process is an order of magnitude better than this article says. The material used and the design of the part influence how much it deforms in practice far more than the injection moulding process itself.

In their own description of Sterrox® LCP they say it has "extreme tensile strength, exceptionally low thermal expansion coefficient, high environmental inertia and excellent dimensional stability". With such an advanced polymer any deformation in operation has to be a rounding error compared to the manufacturing tolerances.