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Great question 👌 — editing STL and OBJ files depends on what kind of editing you need to do 3D design, repair, scaling, text engraving, etc.. Here’s a clear breakdown 👇

🧩 1. Editing STL / OBJ Files – Basic Understanding


STL Stereolithography – mesh of triangles no solid or parametric data.


OBJ – includes 3D geometry and sometimes textures/colors.
➡️ Both are mesh models, not editable like CAD solids — so you’ll use mesh editing tools.



🛠️ 2. Best Free Tools to Edit STL / OBJ Files
PurposeRecommended SoftwareNotes🔹 Simple edits (cut, scale, rotate, merge)Meshmixer (Autodesk)Easy for repairing, smoothing, sculpting🔹 Repair broken mesh / holesMicrosoft 3D Builder or Netfabb BasicAuto-repair STL🔹 Detailed mesh sculptingBlenderVery powerful; supports OBJ & STL both🔹 Convert STL Solid (for CAD)Fusion 360 or FreeCADYou can convert mesh BREP solid🔹 Parametric redesignFusion 360 / SolidWorks / OnshapeImport STL Convert Edit with dimensions

🧰 3. Example – Editing STL in Fusion 360


Open Fusion 360.


Go to Insert Insert Mesh select your .stl file.


Right-click the mesh Mesh to BRep convert to solid.


Now you can cut, extrude, modify holes, etc.


Export back to STL or OBJ if needed.



🧠 4. Blender Free – Steps


Open Blender → File → Import → STL/OBJ


Go into Edit Mode Tab key


Use Sculpting, Vertex Edit, Knife Tool, or Modifier tools


Export: File → Export → STL/OBJ



🧾 5. For Quick Fix / Repair


Online STL Repair tools:


www.formware.co/online-stl-repair


tools3d.azurewebsites.net/