If you want to make detailed parts/accessories for O-scale I highly recommend getting a resin printer as traditional FDM printers will leave layer lines that you need to sand down. If you do go down this rabbit hole, go for the bigger print dimensions if you can (better to get it now than buy a 2nd printer later on). On my 9.1" printer, I am making 19th century freight cars as we speak.
The below were printed on my Elegoo Saturn S for my 1/48 Military installation
Bryce
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