Skinny3D download

It is a program that allows you to open and modify 3D models
Counter
Download from the developer's website

Alternative software

Autoconverter
Autoconverter
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This app allows to import, export and convert between different 3D file formats.

ADA3D STL Viewer
ADA3D STL Viewer
Free
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Free program that helps you visualize STL or OBJ meshes.

Gears 3D Printer
Gears 3D Printer
Free
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Free application that generates 3D models in STL.

SharpCam
SharpCam
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Affordable 2.5/3D CAM (Computer Aided Manufacturing) system.

3D Models for PCB Creator
3D Models for PCB Creator
Free
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It is a library that contains 2580 models in WRL format for 3D PCB Preview.