Hi Lovincup! There are several factors we can consider as to why you're getting ripples when printing. Here are a few things you can try:

1. Make sure the belts on your x and y axes didn't loosen up. They should be tight enough to pluck.
2. Try to gently rotate your y bed and make sure it is solid both where the delrin idlers press against the y rails. If they are loose tighten them up so the y bed only moves in the y direction and has no play in any other directions. Also do this with the x carriage.
3. Look under the z carriage and make sure that the two nuts that are on the threaded rods are still seated in their laser cut slots.
4. Make sure your hotend is rigidly mounted to the base of your extruder/x carriage.
5. Verify that the clipped down glass is securely fastened.
6. Verify that your seatbelt is securely fastened and your tray table is in it's upright position

Let me know if this works for you!