You can encode a whole shitload of data into a QR code, by shitload I mean like entire webgames where all the code is self-contained in the qr code that you can scan and launch browser to play them.
In many cases you don't need a lot of data. The shovel 10/22 receiver is 28 instructions/lines (
we build 1022 ! ... (part Odin)). You can literally memorize it.
The last I checked entire repo is on github, there is a lot of shit, but it's all well organized and version tracked (about f***ing time) and stamped with keybase (about f***ing time)
There are a few builders that host their designs on their sites and have tube vids of tests, but those are fewer and specialized.
Also, the biggest win, people post actual models, not f***ing mesh, so you can take a model and easily mod/improve it, not just print it. That's a big winning trend.