How robust are the small resin parts, like your rainwater goods?
I am looking at the idea of signal posts, arms, possibly colour light housings, and 'cabinets' to house the gubbins to make them work..
Not sure if printed resin is strong enough, or resilient enough to not warp or shrink.
PhilP.
The main issue with resin printing is trying to print larger items - as you either need a larger build area or a taller platform lift! Detail items like a lamp bracket or fitting will be fine, but long thin pieces will be harder to print and may be quite fragile. I think I would use a combination of brass for pipework, moulded plastic for guttering and resin for the fiddly bitS
De-lamination is an issue with filament printers, particularly if the part is quite thin. Resin printers can suffer from deformation of the part if it partially separates from the build bed, weeping if uncured resin starts to leak out of a hollow print -hence the small holes you sometimes see, and limited flexibility of the final part.
I am mainly using the Elegoo ABS like resin and even some self sprung knuckle type couplings seem to be very robust, but some standard resin I used to print some figures was very brittle and when I dropped one of them, his head came off!!
For larger parts, ABS based filament prints will last outdoors very well, but some printers - mainly those without an enclosed build area struggle with warping when printing. Once completed however, the parts seem pretty stable. I've also had a lot of success with MDF infused PLA in terms of lasting well outdoors. If you want to print fence parts, crates, barrels etc. this might be the best material. It can be sanded and smoothed like any other print and also stained and varnished, so a good finish can be achieved.