Keep in mind that you just said CNC when you were talking about producing 3cm. That is a huge investment. Sure you save on man hours but you are spending more for:
- Tooling, machine payment
- CNC operater salery, digitizer
- CAD operator
- Floor space for cnc
- Electricity for cnc
- Maintenance on cnc
- Extra man power on installation.
These cost must be factored in because the shop can not absorb such expensive cost. Something has to pay for them and if you are running 3cm, that is what pays for it.