I've posted a project on Maker World to correct warped records using a 3D printer: https://makerworld.com/ja/models/1981269-flat-lab-a1-project-to-correct-12-inch-vinyl-warpa#profileId-2131249 I've also made it possible to correct warped records even without a 3D printer. 【Set Contents】 ・Molds to sandwich the record from top and bottom ・Screws and clips to secure the molds ※-Please prepare a foot warmer separately. A foot warmer that is 40cm square and around 60 degrees Celsius with a timer should work, or you can use something else. Includes foot warmer: ¥8000 Shipped disassembled, so assembly is required. Reference for using a 3D printer: 55°C for 30 minutes: Light warp, for testing 55°C for 60 minutes: Light warp, for actual use 55°C for 120 minutes: Moderate warp 58°C for 60 minutes: If correction at 55°C is not possible 58°C for 120 minutes: Strong warp When using a foot warmer, use a maximum of 60°C for about 2 hours. If you're worried, try it at a low temperature setting on a record that isn't very important. The top and bottom molds are made of PETG material. After several tests, it doesn't seem to react with the record, but if you're concerned, try placing a sheet of parchment paper or similar between them. Reviews on note: 7-inch https://note.com/faderlab/n/nb19ba0b1dace 12-inch https://note.com/faderlab/n/n1a6fd8795857 This is basically designed with a step on the outer circumference, assuming records with groove guards on the outer edge. I haven't tested it on flat records. Disk Flattener Flattern it Pro-ject Record Pi LP Flattener Record Flattener Vinyl Flat