Correct on the accuracy, but you can design parts with features like undercuts and cavities on 3D printing that are either not possible, or much more expensive, to CNC.
Not every metal part requires the 0.001" tolerance you can get with CNC as well.
I look at it as another technology that can be selected when the parameters make sense for it. I'm more familiar with plastic technologies, for them I switch between FDM, SLS, SLA, Polyjet and Injection Molding depending on:
- Forecasted quantity
- Time to market needed
- Price constraints
- Accuracy and surface finish required
- Design requirements
Each technology has it's own advantages and disadvantages.
Not every metal part requires the 0.001" tolerance you can get with CNC as well.
I look at it as another technology that can be selected when the parameters make sense for it. I'm more familiar with plastic technologies, for them I switch between FDM, SLS, SLA, Polyjet and Injection Molding depending on:
- Forecasted quantity
- Time to market needed
- Price constraints
- Accuracy and surface finish required
- Design requirements
Each technology has it's own advantages and disadvantages.