(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Short description of error
in Print3D addon: in edit mode or not:
RuntimeError: Error Object'--temp--.006' has no mesh data to be used for casting
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).