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I have designed this detailed tunnel for my N-scale Layout. so here I am sharing it for anyone interested to make it.
N scale - Use it as it is.
HO/OO Scale - you may scale it up in slicer by 190% and then print
Model is very heavy and detailed so slicer will take 10-15 min to slice so be patient.
Print in sleeping position so it will stick better to bed. PLA is best for printing.
For Tutorial on Painting Texturing and Weathering please see YouTube Link -
Double Track Tunnel (Reworked)