A simple object that the slicer will try to apply scarf seams to both inside and outside (with “contour and hole” selected). The object provides are range of overhangs up to about the limit for (my printer) most printers of 70% overhang (or about 34°). Should take less than 10 minutes to print and only 2g of filament.
Note that the photos provided are of the object printed without scarf seams and with a failed scarf seam because that is why I am testing scarf seams - I can't get it to do anything useful!
I've also added a second object that is bigger so I could take a picture of both the offending seams at once. (You need to draw the seam position to test with this one)
The author marked this model as their own original creation.