Hello,
I am trying to get an idea of how to create my own 3D models that can be opened.

Is it useful to use a free CAD like:

1. https://www.tinkercad.com/
2. https://figuro.io/
3. https://www.selfcad.com/
4. https://app.sketchup.com/
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   Or better do everything in SH3 (with the help of Furniture Library Editor)?
   I found
   1. https://www.youtube.com/watch?v=XGfLfk97eR8
   2. https://www.youtube.com/watch?v=ovsQjD9Fwms&t=177s
   3. [/list=1]
      The first is quite clear but the second does not tell me how to modify a 3D model, I'm a bit lost here...
      
      As far as I understood you need an OBJ file, where you can edit the details in regard to an opening.
      I skimmed the following threads
      1. http://www.sweethome3d.com/support/foru ... hread,2006
      2. http://www.sweethome3d.com/support/foru ... 4_offset,8
      3. http://www.sweethome3d.com/support/foru ... 962DBCDA1F
      4. http://www.sweethome3d.com/support/foru ... 962DBCDA1F
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         thx for giving me some guidance
         stefan