How do i make this file ready for 3D printing?

[Geo]

@stellacarrclarke

How can i make my design ready for 3D printing?

Hello @stellacarrclarke,

In order to 3D print the model, it must be a Solid
See this topic…

Convert Free Make Model to Pro Solids

A Solid in SketchUp is a single Group or Component whose geometry meets certain conditions. When those conditions are met, Entity Info indicates the model is a Solid Group or Solid Component. Also notice Entity Info indicates the Volume of a selected Solid. • The geometry must form a single* airtight vessel. Like a perfect soap bubble … •No gaps •No holes •No leaks • No extraneous Faces** inside or outside the vessel. All Faces must serve to enclose the singular volume of the vessel. • N…

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As it is, the model you shared is far from being a Solid model.

Generally, it’s quicker and easier to start over than it is to fix such things.
Albeit, it is possible, with no small amount of tweaking geometry, to make the model a Solid.
See this section of the SketchUp Sage site…
https://sites.google.com/site/sketchupsage/tweak