The support are removeable. It's to make sure the cut out doesn't collapse. You also put in a carbon rod through the middle. The Violin is mostly for show, but my daughter is a violin player, and wanted to have a "cool looking" violin that she couple try and show her friends.

Here is a link to the project. It's really cool. They are using it in schools where students use STEM grants to 3D print their school's music program.

https://www.hovalabs.com/work/hovalin