I found my gantry being off. Couldnt find any thing in the house hold fitting under the gantry.
Print 2 of them and place on both sides.

Unscrew 2nd rod holding and press both sides to be snug. Make sure to check the pom wheel Binding as well.
See Guide from Pascal for how to.

English:
https://drive.google.com/file/d/1sTHUbAnGNLwwWpDrvgP9OlkK0qBMIdQE
German:
https://drive.google.com/file/d/1PqRAyBb5IpDnMlKbZ8Bcqiw3gcff-k89