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I've bought some 3d printed terrain, and was wondering whether it needs to be washed prior to priming, as one would with resin?

Thanks for any input.

I don't think so. With cast resin its the mould release that causes the problems. With printed resin, you can have some uncured surface residue left, but I haven't found that such residue affects priming particularly.

I would hope that a commercial outfit should clear off the vast majority of that anyway.

Any uncured resin should cure while outside for rattlecan operations.

And as above, the issue lies with mold release and not an inherent property of resin itself.