The STL Check modifier check an object to see if it’s correct for exporting to an stereo lithography (STL) file format. Stereo lithography files are used by the specialized machine to produce prototype physical models based on the data in the STL file.
Step1: Create a sphere
Fig.11
Step2: Convert the sphere to editable poly by right clicking on sphere.
Fig.117
Step3: click on the polygon option of editable poly. Then select a face of sphere and delete.
Fig.118
Step4: click on the element option of editable poly. Then select sphere.
Fig.119
Step5: click on modify tab and select stl check tool.
Fig. 120
Step6: select everything option and tick check option.
Fig.121
The error can be caught in this way. There are four errors here.
Fig.122