You can't enter a world you created, and presumably the digital copy would still exist at the original location to be printed, so you could still return there, but I like the concept!
You could probably just go into a world with teleportation technology and take it out, though :p
Time can be non arbitrarily defined as a round number value of times cesium oscillates between two hyperfine states, to allow time to be non arbitrary and still a useful size.
I have for my worldbuilding project, but it's not famous or anything.
In base 12, there are 2 000 000 000 cesium oscillations in a tik (about 1.12 seconds), and light travels 80 000 000 mata in a tik (a mata is about 0.85m)
Can you expand on what you mean by that? As I thought, the scientific method was about empirically testing things, and the empirical world is defined by what we can sense - ie our qualia.
Isn't the Fediverse already an open source social media platform?