Choose STL when
Your next stop is a typical slicer
STL is widely used for printable surface geometry. It does not have a standard way to carry color or texture.
Quick decision
Start with the tool that opens the file next
Choose OBJ when
Your next tool specifically asks for OBJ
OBJ can describe geometry and can reference separate material information, but importing software may ignore those materials.
Always check
What the receiving app supports
A filename extension tells you the container—not exactly how every program will interpret its contents.
What comes after export
A model file still needs preparation
- Import the file into compatible slicing software.
- Confirm size, orientation, and intended connections.
- Choose printer and material settings.
- Inspect the layer preview before creating printer instructions.
Color is a separate question
STL has no standard color support. OBJ may reference material data, but slicers can ignore it. Treat a full-color result as a capability to verify across the exporter, receiving software, printer, and material workflow.