reply to u/modspyder at https://www.reddit.com/r/commonplacebook/comments/18fbwqx/comment/ko8bksm/

The small plastic binder I use comfortably holds 50 pages, but has room for maybe 25 more (though not 50). You could use several of them for binding together groups of pages like that. Searching around might reveal larger ring binders here if you want larger books.

For larger quantities:

You can use book rings (sold in various sizes) or even binder clips to hold these sheets together in batches, but with the ability to remove them or add sheets later.

File folders might be a useful option too for holding things together in categories.

With some inexpensive book binder's glue and cardboard you could bind together much larger numbers of sheets into custom books for yourself. https://www.youtube.com/watch?v=nivNPCoAHcM is a good basic primer, but you could also do more complicated bindings and covers or have pages bound at FedEx/Kinkos or other higher end professional binders depending on your need and ultimate budget. For this the sky may be the limit, though anything over 1000 pages may be getting awfully bulky.

https://web.archive.org/web/20180227134635/http://pileofindexcards.org/blog/2007/01/27/pile-of-fieldnotes/

I certainly didn't see this coming as part of the Pile of Index Cards... pocketnotebooks! Ostensibly for quick note (idea) capture on the move with transfer later.

https://stationerymanor.com/products/kokuyo-mo-series-round-stencil-template-97018

Kokuyo has a circular stencil/template (WCN-CDTAS13), which one presumably holds down in the center and then uses the various slots with a pen/pencil to circle around to make their own custom chronodex stencil outlines.

It doesn't take a genius to see how Baum-kuchen could potentially use such a tool or stamp to make a branded chronodex that also might suggest the circular layers of an actual Baum-kuchen cake.

https://www.jptamerica.com/