This is a printable Mould and Deckle set for making paper. You'll need some screen material and (optional but highly recommended) ¼" magnets.

There are two sizes included one for 8.25" square paper, and one for 6.5" square paper. The 8.25" size should be printable on a printer with a 256x256mm bed and the 6.5" size will fit on a printer with a 180x180mm bed.

I've written a blog post with more information: 3D Printed Mould and Deckle

I may try to clean up the OpenSCAD file and add it in, as it allows for easy customization and other sizes, but it's a bit complex and messy at this point. (If you want a copy or some other sizes just let me know.)