How to create a solid / filled body?

Hi,
I have created two objects for 3D printing. The company printing for me asked me to send them the objects solid / filled. Right now they are hollow (see attachment).

Any idea how to ‘fill’ the objects instead of having only thin walls?
I’m new to 3D design and work with Shapr3D only a few days.

Thanks in advance.

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By the looks of it, you have a triangular shape with think walls extruded a certain height. What you could do is select the inner parts of the triangular shape and then use “Offset Face” - drag the arrows and you will see the shape fill.