Thanks to all.
Problem is solved.
I draw it again with true arcs an now it work perfect.

Thanks again, Yours sincerely

William.

Ow!

man-biting-his-tongue-idiom-showing-white-background-49907145.jpg

Step is a Nurbs format!
Totally different than SKP file!

So you must find a converter!
You have this free stand alone who transform a format OBJ to 3dm by Michael Gibson
(author of the famous Zen Nurbs Modeler MOI3D (not free)
(3dm another commun Nurbs format)
Result will be a 3D wire frame!
It's more prudent to not take files of millions of polygons! 🤓

So transform first your SKP in OBJ by TIG plugin OBJ exporter if you have not Pro version of SU!

Here in Moi but will be the same in another Nurbs program! 😄

http://moiscript.weebly.com/uploads/3/9/3/8/3938813/_3531936.jpg

Another brut force workflow is to use the monster Fusion 360 ! 😄
(there is an hobby free version)
Import your SKP file inside and use TSPline!

Minute 2.30 - 3.00
You can now export as any format you want! (so STL)

@kaas said:

You're not running on old hardware that SketchUp doesn't support anymore?
See more here: https://help.sketchup.com/en/article/36208

that's actually a good point, try downloading the Sketchup 2017 CheckUp app and run that, maybe some clues from that?

See Importing an Adobe Illustrator File

SketchUp can import Adobe Illustrator files in the for of AutoCAD Drawing (.dwg) or AutoCAD Interchange (.dxf) file formats. To Import an Adobe Illustrator file:

Export the Adobe Illustrator file as either a .dwg or .dxf file from Adobe Illustrator.
Run SketchUp.
Select File > Import. The Open dialog box appears.
Navigate to the .dwg or .dxf file.
Click the Open (Microsoft Windows) or Import (Mac OS X) button. The file is imported.

A Google search will turn up a lot of information.

I suppose with yearly updates less can be expected, but, yes, I didn't see anything that had "wow" or "at last!" (sic) flavor to it. The speed improvements probably make it worth my while to go on from v.8, but I don't want to lose 1001bit tools just yet. The 3d warehouse and webgl are looking good, though that's not something I spend much time with myself.

Maybe Ruby 2.0 is a big deal for developers. IDK.

Hello TIG,
it was indeed the openGL settings.
Thank you very much for the quick respons and for this slution.

Best regards,

Willem van der Woude.

Hi KXI System,

Thanks for helping me out, surprisingly easy.

Greetings,
Willem.