Can anyone help me with this 3d model?

SketchUp 3D Printing
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1

I made a model in SketchUp that I would like to 3D print. Of course I’m a complete novice with this software, but I tried to make a model anyways and learn along the way.

After importing the model into Cura it gives me a warning that my print isn’t watertight and that there might be problems printing the model. It shows me the following: (the red parts aren’t watertight apparently)

Screenshot_3
Screenshot_3836×468 111 KB

I don’t know what I did wrong and I’m too much of a novice to fix this. I tried searching to no avail…
It probably is something simple

The model looks like this:

Screenshot_4
Screenshot_4859×531 20.2 KB

Screenshot_5
Screenshot_51022×524 35.2 KB

Screenshot_6
Screenshot_61398×776 68.3 KB

This last screenshot is with the top layer removed. This thing is supposed to be a front bumper cold air intake.
There’s probably a million ways to make that rectancle to circular shape better, faster and easier but this is what I managed to figure out myself

Here is the file itself:
Test intake.skp (612.8 KB)

If anyone could help me with this, that’d be amazing
Thanks in advance!

2

I removed the surfaces and inner faces, and created them anew with Curviloft. This reports being solid.
Test intake.skp (207.8 KB)

3

Click in sequence on the Scenes tabs of this SU file if you want to use only native tools.

Circular to rounded rectangular adapter with thickness.skp (146.9 KB)

4

Thank you for this detailed instruction. I will try to make it like this. It’s very detailed for what I’m looking for

5

Ah thank you very much for this. Now I can do the final measurements before printing it. I’ll try and recreate what you did with Curviloft so that I can learn on how to do this in the future. Thank you so much again