Stormwater drain cap

I was putting down 7m drainage gravel in the garden and I wanted the gravel to cover a stormwater drain so that the water would continue to drain but the gravel would be kept out of the drain. Normally I would buy a grate like https://www.bunnings.com.au/holman-100mm-pvc-dwv-grate_p4780016 at the hardware store, then cover it with flyscreen mesh to do this.

I worked out however I could model my own version of the drain cover using 4mm diameter holes. this would have the same effect but in a neater manner.

Its been in through a couple of storms now and seems to be working well. I have some ideas for improvement but am lazy enough to do that when necessary.

I printed it in PLA with a 0.4mm nozzle.