I need to 3D print this object as a mold. Basically all the walls have thickness except for the text. But when I upload my model to 3D printing services, the walls on the text are not being recognized and just don’t show up. The reason the text has an open back is because the material needs to be able to go inside to take the shape. I need a solution on how to solve this fast. Thanks in advance
This is the face of the mold:
This is the inside of the text that needs to be hollow so the material can take form from. How do I add thickness to it?