This is something that has been missing and is very welcome. It can be very frustrating when you purchase a CAD design and find out after your first print that the model you just bought is actually made for visualisation and not for becoming an actual object.
In comes the WMC (Watertight Mesh Certification™). This is a product qualification label that certifies that the 3d model has passed visual and automated tests to meet qualification criteria specified in the list of model requirements published at watertightmesh.com . “Watertight” is the term used to describe a 3D mesh suitable for 3D printing. In short, it means that there are no holes, cracks or missing features on the mesh, which would make it unsuitable for printing.
Many models that you find online in model libraries are made for visualisation but not for 3d printing. Fixing these models for 3D printing is very time consuming and frustrating. On the other hand, libraries of models specifically created for 3d printing often do not have the actual 3d printed picture of the model so you can ensure its visually integrity.
The WMC logo is a certification to guarantees to the buyer the integrity of the model for 3d printing. It gives assurance to anyone who is passionate about 3d printing using purchased models, and adds certification to freelance modeller’s work, providing to the whole 3d printing market more transparency and better quality and efficiency.