Hey all. New to the CNC world. I recently purchased the 3018 CNC spindle/laser combo off amazon. When putting the x axis rails through the spindle mount, I noticed some definite binding. Even when only trying one of the two rails, the motion was not smooth at all and the rail has a sort of twisting motion as i run it through the linear bearings.

Figured might as well fully assemble it and see how it works. Worked okay for a bit once i got the speeds set properly, but then began jamming itself up and eventually worked loose some of the mounting screws on the vertical frame. The plastic cross brace screw pockets are too deep and the screws bottom out into the aluminum extrusion prior to fully engaging with the t nut.

Has anyone seen this before? Is it just junk linear bearings that get shipped on these units?

Thanks in advance! Looking forward to getting this running properly.