SketchUp Make is licensed for non-commercial work only. This includes the output from the software.
Trimble Navigation Limited and/or its affiliates ("Trimble") gives you a personal, worldwide, royalty-free, non-assignable and non-exclusive license to use the executable version of the Software for non-commercial use only. Non-commercial use means: you may not sell, rent, lease or lend the output of the Software or the Services.
In what ways does this restrict my use of SketchUp Make generated material with sites that allow the sharing of models (and deisgn files)? This would include sites such as Thingiverse, MyMiniFactory and 3D Warehouse.
For example, must I always set a non-commercial license for my designs? Thingiverse allows several different license choices to be selected.
Obviously the SketchUp Pro license makes many of the restrictions on what can be done with the output go away, which would be much simpler. However I do not expect to generate anywhere near the costs of purchasing a license ($695 US at the time of writing) by tweaking a few designs now and then.
I want to comply with the licenses but I need to understand the limits of what I am permitted to do with SketchUp Make in order to do that. It may be much more prudent for me to invest my time in learning other tools that have no restrictions on what can be done with the output.
As this is a legal question it might matter what jurisdiction I am in and what jurisdiction the sites I may share to are in. I am based in the UK. Thingiverse is based in the State of New York. MyMiniFactory uses the Laws of England as a base. 3D Warehouse selects the State of California.