Had a customer job come in for a heat sink!
Using a 4″ side cutter (e.g. slotting) cutter to do most of the work, then cleaning up with a 1/8″ end mill! Plus the usual shear hog, superfly, etc!
Related Videos & Resources:
CNC Machining a Star Wars X-Wing Fighter Chest Plate!
Machining a DIY Injection Mold!