Split solid into complex shapes

You can see from the image what I’m trying to do. I’m sure I’m going about this the “wrong” way. I drew those lines on the opposing faces and then moved the half away but then I had to close up all the faces and it’s not working out.

Direct advice or name or name/link to tutorial would be most appreciated!

Erase all but the front face and then use push-pull to extrude it to thickness.

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I see what you’re saying and that would be the best way if I was starting from scratch (which I may have to do) but I’m looking to do this to an already existing solid.

What version of SketchUp are you using? SketchUp for Schools is a web based version for school children. Is that it?

It depends on exactly what version you are using and what tools you have available. The best way would be to model each part separately in the first place. If you must model the way you’ve done in your screen shot. Use the Line tool to stitch between vertices on the curves to create the faces. It would be faster to do what @slbaumgartner described, though.

Is it? Whoops, I put that because I get my license through my university. I assume base or pro?

It would be either Pro or Studio. Presumably your university is not for 5 to18 year olds. Please correct it.

These are very basic fundamentals that you would understand if you spent any time with the basic tutorials. Go to the Campus.
Simple grouping of the geometry makes two separate solids.
GIF 22-09-2024 12-03-25 AM

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By the way, if you intend to 3D print these solids and put them together, you will need to figure out how much of a clearance you need to model in. That’ll depend on the printer, how much the print media will shrink, and that sort of thing.

Absolutely. I figured I’d do that after I’d settled on the method of splitting/modelling.

Was this intended to come across as dismissive and rude? You’ve made an assumption about what I have and haven’t done regarding training myself on sketchup.

I’m simply making an assumption from what you have given us to go on. I have no interest in being dismissive or being rude, simply stating facts.
And as such I gave you a simple gif to show how to create groups to separate the geometry and a link to some great tutorials. Isn’t that what we are here to supply.

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Except you didn’t actually respond to the specifics of my original post. You provided a way to start from scratch, not split the solid (title of OP) and I requested the specific name/link and you provided the the basic link to all the tutorials.

And once again you have shown me why I shouldn’t bother with helping people.

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Just to finish this, the point is if you understand the software at the fundamental level you don’t need to jump though hoops to get things done, plug ins, extensions only really automate what can already be done, so a grounded understanding of the tools is more useful than a vid showing a workaround.

But I shouldn’t have bothered.

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If you don’t want to redo these objects, as a practice, copy the convex face from the object on the left and past it as a concave face in the object on the right.

But first, delete the few edges that are already visible across the upcoming curved face in the rightmost object.

Making sure I understand your suggestion. In the image, red first then black, then push to carve the opening?

Is this what you are wanting to do?
GIF 22-09-2024 12-41-49 AM

No, for the purposes of the question, I kept the original solid simple. You start with a rectangular solid and then split the rectangular solid along the “doorknob”-like shape so that it becomes two separate interlocking objects.

Move the goal posts as much as you like, understanding how the sketchup geometry works is the basis of enlightenment.
Each specific option has various solutions, some better than others. Experience helps you see the better choice, sometimes for efficiency, sometimes for material gains and so on.

My original reply was a visual extension of what @slbaumgartner offered in the first reply to your post.

Going back to your original post, you asked how, mentioned you were probably doing it wrong and gave us an image that quite frankly showed really basic errors.
From all that we can only assume you could do with catching up on some basics , hence the Campus link.

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By the way, a simple version of your original question using solid tools.

GIF 22-09-2024 1-17-31 AM