I tinkered again and changed the recirculating ball nut to a polymer nut I printed myself. It is now nice and quiet.
https://www.youtube.com/watch?v=XKE-ZNU8usU
Unfortunately, there is a sad announcement. I will no longer be running servers as they are unfortunately not being used. However, I will continue to get one up and running from time to time or upon request.
I hope you are all well!
Many greetings
Tikal