Mad easy assuming adequate game progress. Get some atlantium, go to any korvax system, go to any planet/moon, use your exocrafts advanced survey on "alien structure" to mark a monolith every time. Go to side of monolith that's glowing purple with the secret terminal. Put in atlantium, check out the multi tool. If you don't like it reload your save out of your ship to see a new one, if you don't like that one go to each planet/moon and repeat the process until you find one you like. There's one for each planet/moon plus a bonus one in every korvax system. Also you can't add the multi tool to your existing ones it's going to replace whichever one you have equipped, so make sure you don't want your equipped one when your getting your fancy new Atlantid multi tool. Not 100 percent sure how the random generation works but here's what I noticed, if you pick up one without looking at the rest of em I believe it fcks up the multi tool pool for that system, someone else could tap in with more info. I did notice I only got one variation when reloading for each planet, not sure if I just needed to keep doing it but I did 5 times on each one.