that making a mold can be prohibitively expensive. Has the advent of affordable CNC machining changed that? [Teaching Tech] takes a look, and machines a mold for part of a bicycle bracket.

Lenses, mirrors, optics and the mold inserts that enable making such parts at scale have long been machined with tools ... Diamond machining applications can require plotting motion in such detail ...

If you’re looking at CNC machines, or machine tools ... part of this build isn’t globbing up a mold with epoxy resin. No, the real trick here is making sure the rails of the CNC are aligned ...