What are the Limitations of CNC Machining Plastic Parts?

Tool Wear: Cutting tools can experience wear and tear, especially when machining harder plastics or when high cutting speeds are used. This can affect part quality and increase production costs.  
Heat Generation: The machining process can generate heat, which can cause the plastic material to soften, melt, or deform, potentially affecting the accuracy and dimensional stability of the part.  
Material Limitations: Some plastics may be more challenging to machine than others due to their physical properties. For example, brittle plastics may be prone to chipping, while flexible plastics may be difficult to hold securely during machining.  
Cost: CNC machining（https://www.jtrmachine.com/cnc-machining-service） can be a relatively expensive process, particularly for complex parts or small production runs.  
Tooling Costs: The initial cost of developing and maintaining CNC cutting tools can be significant.
Limited Material Thickness: There are limitations to the thickness of the plastic material that can be effectively machined. Very thick parts may require specialized tooling and techniques.