Export to STL - missing parts and triangles

Hi to you all,
I’m a noob in sketchup :slight_smile:
I’m trying to export STL file but no matter what I do, the stl file is missing parts of my model, and some weird triangles.
For example the lower boxes in my model disappear.project1stlTest.skp (1.9 MB)
The model is solid, so what am I doing wrong?

Bump… please help :slight_smile:

Solid inspector 2 says you have 34 reversed faces, and fixed them with one click.

After that, the model reports ‘everything is shiny’.

When I export it to STL it now looks fine - an import back to Sketchup looks like this:

Here’s the STL file I exported.

project1stlTest.stl (12.4 KB)

There’s also a separate 12-sided tube way off to the right in the model that may be confusing things. I didn’t include it in the STL export.

You have used the largely useless 3D Printing template.

Purge your model of this (Window/Model Info/Statistics/Purge Unused), and it comes down to a much more reasonable 73kb size.

Hi @john_mcclenahan
Thank you very much for your reply!
You are right, when importing the stl file into sketchup everything looks fine, but when I import the stl file to tinkercad, some boxes are missing:
I used your stl, and also removed the tube in my file and imported to tinkercad, and got the same results.

Thanks again!

Hmmm. I’ve almost no experience of TinkerCad so I don’t really have any idea why it doesn’t like the STL.

It’s not even as if your model is particularly small (Sketchup has trouble with very small faces).

What 3D printer are you aiming the STL for? Is it just too big a model for it?

Could you try separating your model into smaller pieces, each made as a component, and experiment to see if one part is causing the trouble?

Or maybe TinkerCad has a different view of what makes a solid than SU and the Solid Inspector2 plugin?

I have seen earlier posts by @DaveR referring to a web service that he uses to check whether models can be printed, but can’t remember the name of it. Dave, can you help here?

Sorry, but I’m just guessing blind here. I don’t really know how to help further.


Purge your model of this (Window/Model Info/Statistics/Purge Unused)


The 3D Printer dynamic component contains information about the print volume and shape for a wide range of 3D printers. A large fraction of it is redundant, and all you really need to know is the size of your own printer or printers.

So you can delete the component, and purge the file of its data, to reduce the file size dramatically - the 3D printer component is well over 1MB in size and is of really very little or no use.

Start instead with a template like Woodworking (Millimetres) if your printer works most easily in mm, or Woodworking (Inches) otherwise.

It’s i.materialise. There are others as well.

Thanks guys,
I don’t know the 3D printer, as I’m going to send it to a 3D shop.
I will try the website, and to split it to parts.

Thanks again :slight_smile: you the best