Given that you do need a machine that runs 24/7 to run Tailscale, I think it's very reasonable to describe it like that. Sure, maybe you can install it on your Windows machine, and figure out all the networking bits that will get it to talk to the printer, but for the average person that might as well be sorcery.
Have you set up Tailscale and have you set up OpenVPN from scratch? Because these two things are not alike. That’s why I’m pushing back a bit.
I find it difficult to imagine equating a raspberry pi in a closet with “running a server”. Is it technically a server? Sure. But it’s not as if we’re talking about running a power hungry rack.
Bottom line is: there are very cheap and simple/easy options for maintaining a private connection to your home stuff.
> and figure out all the networking bits that will get it to talk to the printer
With something like Tailscale this is already figured out. My mostly non technical brother does this without issues.
This is entirely separate from whether or not you should need to do so for Bambu printers, which again I agree the answer is ideally “no”.