There is not a given set of tolerances that fits all processes and materials. In every case, the final tolerances on your part will depend on a number of factors, including but not limited to:
Part size
Design geometry
The number, type and size of features
Material(s)
Surface finish
Manufacturing process
Once your order is confirmed, we will review your design and provide a design for manufacturing review, pointing out any areas where we may not be able to achieve your desired tolerances. It’s helpful if you can specify which areas in your design have critical tolerances that must be met and which can be slightly modified if needed to reduce time and costs involved. Here are some general tolerance guidelines:
General tolerances for CNC machining in metal and plastic
Plastic injection molding tolerances
General tolerance for metal 3D printing is +/- 0.5mm
Shrinkage rate of +/- 0.15% is to be expected for vacuum casting
All manufacturing and technical specifications need to be clearly specified in the 2D drawings in order to be followed.