High quality curves are at the heart of high quality surfaces, especially when you are developing early/primary/slab surfaces that many things will be relying upon downstream. Today I demo a new set of tools (and some built in techniques) I've created to manipulate curves in Onshape: Elevation, reduction, subdivision, reapproximation, and tweak. If you like delving into curves then this video is for you. (Note it is not an end-to-end demo of a fancy finished surface design...) Here is the published custom feature for Curve evaluation: