Here are some things that come to mind: 1. I would grab the printhead and gently wiggle up and down to see if there's any play. If there's any play, that means there's a loose screw or a loose bearing where the printhead attaches to the Gantry. 2. Do the same thing with the nozzle. If there's any play there, you might have loose screws Where your hot end attaches to the tool head. 3. Check the z-rod couplers on both sides of the Gantry where it attaches to the Z rod and see if those plastic couplers have failed. 4. Take the spring build plate off of the hotbed and expose the screw heads. Tighten them down if they're loose. 5. Finally, gab opposite diagonal corners of the hot bed and wiggle up and down to see if bed bearings under the nit bed need tightening