AUTOMOLD3D · GUIDE
How to Make an STL Watertight
A watertight STL has no boundary edges and represents a closed volume. Validate the mesh, attempt repair when appropriate and inspect the output before slicing.
Open tool →A practical workflow
- Upload the mesh and inspect the topology report
- Choose whether to attempt small-gap repair
- Compare the repaired preview with the original
- Download only after the result passes your visual check
What to check
Supported mesh inputs are STL, OBJ, 3MF, GLB, GLTF and FBX. STEP, STP and IGES should be exported to a mesh format first. The geometry workflow runs in your browser. Quote and account actions are separate services and are only used when you submit them.
Frequently asked questions
What should I check before I start?
Confirm that the model is a supported mesh format, review its orientation and inspect it for obvious holes, overlap or thin areas before generating or splitting geometry.
Does this replace a slicer?
No. AutoMold3D creates or prepares model geometry. Use your own slicer to set printer-specific layers, supports, materials and G-code.
Should I inspect the output?
Yes. Preview and inspect generated mold or split parts before printing. Model geometry, material choice and printer behavior are project-specific.