Originally shared by https://www.reddit.com/user/DurgeDidNothingWrong/ on Reddit.
This will keep a single egg in the chest to the left of the bio, and every ten minutes it will then recycle the egg into two.
One then becomes the next seed egg, and the other either gets sent to the upwards output to seed other bio factories, or burned if it is not needed.
You can set it to export or burn based on the arrow signal you see near the bottom right.
This does assume you have constant power. If the power goes out, the ten minute timer wont count down, and this might leave the egg vulnerable to spoiling into a monster.
If you fail to feed it nutrients as well, then the egg will not be able to craft the recipe and might sit in the biochamber until it spoils into a monster, so keep nutrients flowing.
If I make a v2, it will make it so the inserter that takes the egg and puts it back into the biochamber will check if there is enough water & nutrients, to avoid the above scenario, and if not send it to burn.
This will also mean you'd need to find a new seed egg.