Several times I had the problem that support structures wouldn't immediately stick to the raft (unlike the model, which stuck very well), preventing the actual structure to develop.
Instead, it'll pollute the model with bits of ABS that should have become the support structure.
I think the best solution would be to print the bottom side of the support structure the same way the model is printed, or perhaps even stronger than that, integrating it into the raft.
Both (support structure and raft) are disposable anyway.
This seems to happen when the support structure is especially fragile and thin - so it would make sense to me that the support structure were especially reinforced at the bottom.
Maybe a minimum size for the base as long as enough space is available?
It may waste filament, but less than reprinting the model does
I realized that by playing with the support settings, I can force Voxelizer to create much more support than it usually would - i.e. by setting the cutoff angle to 1 degree, it'll create support all up to the point of the structure being in a right angle.
Which is VERY useful for a structure with very light grounding, which otherwise would only get a few dabs of support here and there.
(See also the above text about support needing better grounding.)
But the main problem remains - the program tries to make support as lightly as possible. Sod that! Give us an option to make it massive. Once around the whole structure, several millimetres wide. If I'm printing a circle tower, plonk a donut around it to keep it stable.
I realize this will be a problem when trying to remove the support afterwards, but it can't be more of a problem than having a slanting tower of ABS, or supports that pollute the model instead of supporting it.