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Did you decide on a printer?

your looking at more like hours long prints. for bigger things it's not unusual to get print time in the days.

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well 3d printing is literally printing with melted plastic. your durability is going to be tied to what filament you use. i dunno bout you, but id use 3d printing to make a plastic counterpart of some piece i need. make a mould and make the part out of some regular strong material. like epoxy or metal.

but that being said im sure there are some damn good filaments out if your going for strength the prints with take alot longer because you just lower the slicers settings so the increase infil on whatever your building thingiverse is a decent place to find parts you wish to print if your not skilled enough to create the .obj files yourself. i say this as a guy who wanted a 3d printer but never bought one because.....i feel its too early to jump on this bandwagon.

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got to https://www.cytu.be/r/sleepsnug and ask a guy called Erotomaniac

Well, yes, but actually no. The "maintenance" is more aptly described as calibration and setup. Or tuning if you prefer. The strength, quality, and accuracy of your prints is highly dependent on how finely tuned your settings are and verifying they remain in spec. Typically, it takes the longest amount of time on initial setup (can easily take an entire day). Once you have it set up initially, usually after that it's just running a few quick checks to verify your machine hasn't gone out of tolerance.
That said, the best materials for strength are Polycarbonate (PC) and Carbon Fiber (CF) filaments. The downside to these is that they both require relatively expensive machines to print. Now, you will find machines that advertise they can hypothetically print these materials, but the issue is that they require sustained high temperatures to set properly. As a result, you'll need a 3D printer equipped with a heated bed AND an enclosure. As far as strength goes, compressive strength and shear strengths can be quite high, while tensile strengths are pretty low on account of the way layering works. You can, however, get around this in some cases by simply changing the print orientation of a part. So that any pulling forces will be parallel to the layers rather than perpendicular.

I'd say 3D printing's application is best viewed on a case by case basis. Most of the things you've listed would be perfectly fine for 3D printed parts.

I would highly recommend you look into Qidi printers like the X-Max. It's pricey, but it kicks ass.

Here are a few videos on Polycarbonate filament you can watch in your free time: https://www.youtube.com/watch?v=tXLroVcw1MQ
https://www.youtube.com/watch?v=RDCvyALeN0E
https://www.youtube.com/watch?v=onjT1Y7oFuU

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Resin printing is better for small high detailed prints like miniatures for DnD. For the larger models you want you'd definitely need an FDM printer. You can get high quality strong functional prints with a >$500 FDM printer. Print speed depends on nozzle size and layer height. Standard nozzle size is .4mm with a .2mm layer height, but you can go up to .8mm nozzle size with .4mm layer height to cut the printing time in half, and still get high quality functional parts. And then you can expose the model to acetone to get a smooth finish, as another person mentioned, but it's not totally necessary.

Look at this nozzle size and layer height explanation/comparison to see what I mean.

https://3dsolved.com/best-layer-height-for-3d-printing/

If you want functional you use an fdm printer. If you want pretty use a resin printer.

It takes forever to print.

I had good experiences with a FlashForgr Adveturer 3 and PLA fillament.

I would trust a scope mount it made, but it's still plastic.

You are probably going to want to print in ABS you will need a good heated bed, an enclosed printer helps and then you will need to expose the parts to an acetone chamber to make the parts stronger and smooth.