System information

SolveSpace version: 2.3
Operating system: MacOS High Sierra

Expected behavior

Exported STEP file should be readable

Actual behavior

STEP file was not readable by many sites

Additional information

After completing the excellent "bracket tutorial", I tried loading the resulting "Export surfaces..." step file to the Weerg site which produce automated on-line quotes (very cool). The part did not load and caused an error.

Based on the statement that Solvespace STEP files have been successful in the past, I tried to submit incrementally more complex files to find out if something in particular causes the problem. I redid the tutorial quickly and loaded an incomplete part and it loaded fine! I went back to the part from the original tutorial and deactivated the later steps (so the product is just an angle with an inside radius: no gusset and no holes) and to my surprise this part still caused an error. The two parts (try1.stp and try2.stp attached in zip) are similar (not identical) but only try1.stp causes an error.

In trying to understand the difference I looked at the step code, but .... it is too hard to understand. Last thing I did was to export the *.slt versions of these files in the hope that my slicer program would give me a hint of what is going on. Indeed the stl model was also faulty for the first try and fine for the second. The slicer program detected 12 non-manifold edges (see messages in lower right corner of two images below). This may help understand what is going on.

Archive.zip