New cooling channels
Add cooling channels that follow the part's shape, by toolroom work or a bought insert, a steel piece of the mold.
| Cost | About $5,000 per insert |
| Payback | Not counted |
| Limitation | The most expensive way, and the mold leaves its press for the work. An insert pays back within a year only on a job where it frees about 130 press hours per year. |