OBJ to STL Converter

Converts OBJ geometry to STL for 3D printing and modeling workflows, with optional unit scaling and format choice.

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About This Tool

The tool reads an OBJ file and converts geometry to STL by triangulating faces and exporting either ASCII or binary STL. It processes vertices and normals, ignoring textures and materials for the final mesh, and applies a unit_scale factor to convert units as required.
Conceptually, the workflow parses vertex data, expands polygons to triangles, assigns normals from winding or computed cross products, and writes the STL in the chosen format. Optional features include deduplicating vertices and controlling decimal precision.
Who benefits: 3D printers, product designers, asset developers; Use cases: preparing models for slicers, archival storage, and pipeline automation. Unique value: explicit handling of unit scaling and format choice, with a clear conversion report.
Core features include triangle generation, unit scaling, ASCII/binary output, basic integrity checks, and a downloadable report.

How to Use

  1. Upload OBJ file and set output_format (ASCII_STL or BINARY_STL) and unit_scale.
  2. Optionally enable merge_duplicate_vertices and set output_precision.
  3. Run conversion.
  4. Download STL file and optional report.
  5. Validate in your slicer; adjust unit_scale if needed.
How to use converter obj em stl

Frequently Asked Questions

Find Quick Answers

What formats are supported?
The tool exports STL in ASCII or binary format per the selected option. Output can be used directly in most slicers and CAD tools.
Does it repair geometry?
The converter triangulates polygons and performs basic cleanup, but it does not perform advanced repair for holes, self-intersections, or non-manifold issues.
How are units handled?
Coordinates are multiplied by unit_scale. A value of 1.0 treats OBJ units as the target unit (commonly millimeters in printing pipelines).
How large can files be?
The tool handles typical model sizes; extremely large assemblies may require chunked processing or longer processing times and may trigger memory limits.

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