Very Basic safe automation of Production Modules. It makes sure there only ever exists 1 egg in the system. It will also shut down if short on ingredients to make the next crafting cycle, or if the output chest is getting full.
I threw some quality modules in there and 3x of these have been my sole production of quality modules. I play on a server that doesn't pause when you leave, so the slow output has been fine due to lots of time.
I also included the spawner stopper in the book. https://www.factorio.school/view/-OEouOFoD9FjBzspii-9
Combined these two are fantastic!
*(Picture is my setup. The BP is just the contraption. I was in the middle of biter territory and converted a wild one.)