About this 3D model

Just provide your own dimensions, mesh kind and cell sizes, height and so on. This thing should handle any fan size and fan guard requirements. I needed it because I broke twice the fragile fins of a 30 mm fan while it was on by waving a screwdriver around. Now it is safe. Hey, you can even generate filters and bee's nests with it! Nb: the last pic shows a blue Nylon version made by yzorg, where the raft itself is explicitly left in place for a finer filtering mesh (check the "make" section).