[theophrastus]

Here's from 2014 with some capacity calculations [0]. "ssh private key (900 bytes): 15 feet of tape."

[0] https://heepy.net/index.php/Data_storage_capacity_of_teletyp...

[Nzen]

If we prefer paper but relax the teletype constraint, Oleh Yuschuk's PaperBack [0] allows encoding 500 KB on a sheet of printer paper.

[0] https://ollydbg.de/Paperbak (posted various times to HN)