I had to reprint my core due to damage. I put the new core on and it wobbles. I’ve made the holes in the clamp loose for the nuts. It seems to wobble on the x so I assume the y axis is the issue. I’ve tried a lot of things on the forum and it still wobbles but only less than a mm now. It needs to be fixed. I made this machine about two months after the primo came out and love it just stressed about this qobble
Can you post a video of your wobble. You cant upload directly to the forum but you can upload it to youtube or any other host and post a link here so we can get a better idea of the issue
Better video I believe
I had this with my MPCNC as well. The recommendation then is to do it the other way round than the instructions say: Take the clamps off and fasten the bolt that goes through it first, then attach it to the core. That usually helps. 