Choose a 3D modeling software
Define the object’s dimensions
Create a basic shape
Add details and features
Keep the design manifold and watertight
Avoid thin walls and unsupported overhangs
Check scale and units
Export the model as an STL or OBJ file
Repair mesh errors if needed
Slice the model with 3D printing software
Set print settings
Preview the sliced layers
Save the G-code file
Print a test version
Adjust the model if needed