Let me be honest with you. Most articles you‘ll read about machining PEEK will tell you that you need a $200,000 five-axis machine, liquid nitrogen cooling, and a shop floor that stays within 1°C all day long. And sure, that stuff works. But here’s what those articles won‘t tell you: I’ve hit ±0.005mm on a plain old three-axis mill in a shop where the temperature swings 15°C between morning and afternoon. No climate chamber. No cryo budget. Just a few hard-learned tricks and a lot of respect for what PEEK actually does when you try to cut it.