SketchUp Won't Consider Component a Solid


I am designing a model of a V12 engine and gearbox combo for a model car. I have created most of the engine internals without a problem but I am constructing a crankcase around said internals and SketchUp won’t consider the crankcase component as a solid. Because I am running through a free school account, and because of my platform, I only have limited native tools and no solid inspector. I have read about other people’s problems before on these forums in order to solve my own problems but at this point, I am out of ideas.
Disclaimer: This is only half the crankcase I was planning on using the flip along ____ axis, function to create the other half. Also, the actual model itself does not include any of the internals portrayed in the pictures and is just the raw component.

I have been checking the entity info tab religiously throughout the creation of the component so I have a relatively good idea of when the problem would have occurred. After creating the part that houses the cylinders (most visible in picture one) the component was solid. Then I added the clutch housing (circular hub on the front of the model visible in picture three) intersected it with the part that houses the cylinders and that was solid too. Then I added the flat plate on the backside of the model (visible in pictures one and two) and intersected it with the first two parts and these three formed a solid component. The problem occurred most likely in the next 2 steps because after these two it would no longer register as a solid. In step four I added the interior of the crankcase (Most visible in picture two) and intersected it with the rest of the model. I was not able to check step four in the entity info tab because it only formed one face, however, I highly doubt that the problem occurred here because the intersect faces tool did its job flawlessly. In step five, where I believe the problem occurred, I added the outer ribbing (visible in picture one) this also should have created the faces that made the model solid again however I had some trouble with the interest faces function where the faces created in this step meet step one. At the end of steps four and five, the model no longer registered as a solid even though I could have sworn it should be. Even though it wasn’t solid I decided to do some final touches (like the hole in the bottom of the crankcase) before I came and asked you guys.

The model is here Lamborghini V12 Engine.skp (3.7 MB)

I know this is a mouth full and a half, but I would appreciate all of the help I can get to make this a solid component for 3D printing. Also, it would be great to know: Other than using the entity info function, what can I do with native tools and no solid inspector to try and prevent or fix future non-solid components and turn them into a solid?

Thank you in advance.

You can spot the errors if you know how to look.
Use the ‘profile’ to spot hole where they shouldn’t be. A profile should show only when there is an edge with nothing next to it, so the perimeter of a shape, but if it is showing down an edge that should have a face either side there must be a hole there.
See this gif, the strong profile show a problem with this area, a redraw fixes it, you’ll find similar at the other end, you can just trace the edges in that case.
Smoothed faces not continuous show there are double faces, find them and delete them as in the gif, you’ll also find some very small triangles down at the bottom of this area on the depression.
Multi faces
Fix those and it shows as a solid.


As suggestions to avoid such issues in the future:

  • work at a larger size so that you minimize chances of issues with vertices too close together. You can scale the model down to real size when it is complete.
  • set the projection to perspective instead of parallel. Parallel is more likely to cause issues with clipping.
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I thought that Solid Inspector was available as a native tool in the web-based versions of SketchUp. I apologize in advance if that is not the case.

It’s an upgrade item, available in shop not in free. I’m surprised if it’s not available in the school version.


I finished the changes you guys advised and I appreciate the work however even after all of this it still won’t consider it solid. Here is a picture after all of the updates I can’t see any other profiles where there shouldn’t be or faces that are out of whack. Here is the updated version of the model as well. Any other ideas, maybe run it through solid inspector?

Lamborghini V12 Engine (1).skp (3.7 MB)

Sorry forgot to attach the picture.

You missed the tiny triangles at the bottom.
Tiny triangles

Sorry, I am just getting to this now, but thank you so much! The model now shows as solid, and this helps a lot. Credit where credit is due, Box you are a genius, sorry I didn’t pick up on the smaller triangles at first. I have to ask, how were you able to find that smallest triangle?
Also thanks for the tips on how to pick up on / avoid such issues in the future, I have heard about sizing up models before to get faces to intersect better but have never really used it, I will definitely try it out.

Thanks again!

Experience. I knew to look for it as the hidden geometry was showing some very small edges in that area.
But that comes for spending a lot of time finding errors before extensions like solid inspector and fix it existed.

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I figured that experience would be the answer. I just hope that I can get as good as you at spotting errors given my limited tools. Thank you guys again, this has been a very big help!

You could download 2017 Make, the last free version for desktop, it is still available and would give you access to many extensions, including Solid Inspector. Not for commercial use.

Edit: sorry won’t run on a chrome book.

I’ve thought about finding a way to use a different version of SketchUp but I’m pretty happy with the way things work right now. Besides I personally think that while more difficult it is way more fulfilling to use native tools when you actually get it right especially when it comes to really complex shapes. Anyway, thank you again!