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Yes this is designed with regards of structural integrity to work in the O-scale, but keep in mind that this is with PLA so if you print with a stronger material then maybe the track joints will be strong enough. I guess it's the beauty of 3D-printing after all, just go ahead and test. :) I have not tested, but if you do it would be nice to see the results! :) Generally I would presume that for H0 scale the SLA style printers are more suitable to get good enough details.