The normals are reading extremely well across all of your objects. There is nothing wrong with a clean environment as long as it is complete, good stuff.
There is a seam here and there that you could have hidden a bit better, like on the front top of the printer, but that would be relatively unnoticed if you were just running by a printing ingame.
the problem is not lack of grunge, but lack of different looking materials. everything has exactly the same specularity, the same glossiness, and the same bland gray tones. the objects just sort of blend into each other. don't forget, plastics and metals have more than one look to them.
get some variation in your basic materials before you go any further. there is so much cool stuff you can do to make them stand out!
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There is a seam here and there that you could have hidden a bit better, like on the front top of the printer, but that would be relatively unnoticed if you were just running by a printing ingame.
get some variation in your basic materials before you go any further. there is so much cool stuff you can do to make them stand out!
Experimenting with spec / gloss maps