My 40w recently started scoring wavy lines. I was running my score lines around 70mm/s until I started get wavy lines. I reduced speed to 30mm/s and it fixed the issue. Just the other day the wavy lines came back and now my speed is set at 10mm/s to fix the issue. I have checked tension on all my belts, made sure my z axis plate is not loose, and I have even secured my table better thinking that the laser was causing it to shake and creating the wavy lines. Reducing my speeds has killed productivity and would love to get back up where I was. Thanks in advance!