I don't like existing notebooks at all: you need blank sheets of paper to sketch, and most notebooks are either lined or squared. They also lack a bookmark—you have to insert all sorts of papers, which is inconvenient. I want the sheets to be A6, without any curves. The cover should protrude slightly for aesthetic reasons. I thought: why not make my own notebook, one that will be uniquely mine, my very own. No sooner said than done!

The pages are white, cut with a special paper cutter from 80 g/m²  paper. I punched the holes with a regular hole punch; I printed a stop for it to keep the holes at the correct level. I 3D printed the cover from black PETG plastic—it turned out very stylish. I printed the bookmark ruler in the same way as the cover—it attaches to any location on the notebook and can be used as both a bookmark and a ruler. I used a spring from an old notebook—it turns out you can carefully remove and reinsert the pages. The process requires precision and time, but the end result is very pleasing!

source code: https://github.com/maxistar/3d_models/tree/master/openscad/blocknote