If you’re using cheap filament, also consider cranking up the infill percentage. I recently printed something for a friend that is almost a 15cm diameter sphere at something like 85% infill. Every time I hold it I’m surprised by how heavy it is. I haven’t tried it, but I think many slicers will let you change the infill percentage after reaching a particular layer, so you can make something bottom-heavy to prevent it from tipping over.