Mistakes to avoid
Perform dimensional and stress calculations for plastic parts

The first mistake would be to choose an unsuitable material; no matter how many dimensioning calculations you make, if you fail to take into account one of the components that complements the stress that will be applied to the planned object, you'll encounter non-conformities.

Similarly, the number of items to be produced is essential. Production of a few pieces (sometimes just one) and large-scale production runs are not the same issues.