I'm trying to create a template for a rubber stamp mold as in the following figure
The idea is then to import an SVG curve which will be given a Z-dimension, and placed inside the template as in this figure:
Then, the SVG mesh will be subtracted from the template using a boolean modifier. However the difference modifier does not seem to work, giving the message "Cannot execute boolean operation". At first I thought this might be due to conflicting normals, but I have checked this. I have also made sure there a no non-manifold faces.
I decided to eliminate the solids in the object one by one, and I discovered that I could delete all of the letters except "INL" and it still wouldn't work.
However, once any of the remaining letters are deleted, the difference modifier works as expected. Why does it not work on all the letters together?