There is a difference between contaminated water, like in Fukushima, and regular non-contaminated cooling water. There should be no radioactive contaminants in the water that the French nuclear power plants release.
yggdar
Sure, but that isn't how it works under GDPR. You don't need to prove the information should be deleted, you need to prove the information must be kept. To give an example, the company I work for deals with long-lived contracts (often 20 years or more), and once they end we are legally allowed to keep the information for about 5 more years. After that we need to remove it.
Are you expecting a developer to test everything every time they commit? Thoroughly testing even a small application or feature subset will take up quite a bit of time. You also want devs to commit often, so it is easy to roll back an approach that didn't pan out, or just to go back and figure out what change caused something to stop working. If you end up committing only a few times per week because everything needs to be thoroughly tested, I'm not convinced it is a good approach.
In terms of software, there are plenty of options but I use Fusion 360 for anything CAD. It is a professional tool that you can use for free for personal use. Blender works well for more artistic things, or organic shapes, and is also free.
In terms of hardware, I don't have enough knowledge or experience to help you. I'm running a Creality CR-10 V3 and very happy with the results, but I'm not sure it is your ideal printer.
What you should definitely do is figure out what kind of materials you want to use, and how large you want the print bed to be. Those are going to influence your choice a lot, and it will help someone with more knowledge to recommend something 😀
Which programming language will you use?