When the Bed was moving at a certain Speed, something was vibrating. I discovered that the holes where the y-rods are connectet with the frame where just a little bit to large and therefore it made annoying noises (Vibrating). So i made these to eliminate that.
Measure your Rod diameter and choose the right size so it has a tight fit.
Update: I rebuild my Anet A8 to my own Version of the AM8(But with Ballscrews and CPC 15 Linear Rails). If you can spend the Money i highly recommend building a AM8 out of your Anet :) It just looks much better and Cleaner lol (also works better obviously)
If you're from Germany you can buy this Kit with mechanical Parts: https://www.dold-mechatronik.de/Anet-A8