**Hello. **
I took a car stl model from the internet, and added a caravan design that I designed on shaper3d, but there is a problem. I don’t know why the design is not saved in stl format for printing. I want to know the solution to use it in my next designs. Is there a way that can be applied?
thanks 
Start a trouble ticket and upload your project. The nice people at Shapr should be able to tell you why you are getting that error. If I had to guess I would say you have bodies overlapping each other.
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I’m having this issue too! Before one of these updates it used to send a warning message but would allow me to export stl anyway… all my designs have printed fine with this error message but can not do this anymore. The ‘fix’ option just undoes all my work😭.
Is there a way I can export anyway like I used to? If no 50% of my work is lost 
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