Since apparently only the Belgians can have nice things, yesterday made myself a couple of notebooks with removable sheets.

Advantages:

* does not require a trip to Belgium¹.
* Respects one international standard (ISO 838), and the sheets can be stored in a regular binder after I'm done writing them.
* I've had fun making them.

Disadvantages:

* Adding and removing sheets is easy, but not as easy as the real thing.

The .scad file for the rings is quite trivial, but if there are requests I can publish it somewhere.

¹ yes, I know that the website lists distributors for my country, but I've never seen it sold anywhere.