Designing a 3D-printable orthodontic retainer using the Medit Design app 

Proof of concept video showing how to design a fixed orthodontic retainer on the Medit Design app. Please note that resins have not been specifically developed for the mild flexure required for fixed orthodontic retainers, so fabricate at your own risk. I would recommend a more flexible type of resin such as Flexcera Smile Ultra + that can provide some slight flexure.