Summary

I needed a cover for my Diskô (Brazilian) refill pages: https://www.lojadisko.com.br/produto/refil-quadriculado-90g-caderno-disko-50-folhas/

The size of the cover in the STL file is 185 x 245 x 1.
The pages I'm using are M sized: 19×25,5cm.

Resize z to 0.5 to get a more flexible cover.