O型模型列車單線石質(zhì)隧道洞口

This is more detailed veion of my original tunnel portal for O Scale Model trai like Lionel or MTH. The exterior dimeio are based off the MTH single track portal. The internal dimeio have been expanded to give more room for trai when the portals are italled near curves. This is a modular design that can be printed on smaller 3d printe like the Davinci Mini. The internal dimeio of the portal when assembled are: single track width ~4.8 inches 146mm height ~5.75 inches You can print the base pieces and rear connecto without supports. Both upper sectio and the keystone need to be printed with supports. I recommend using a .2 resolution with a 15% infill. I have not fully printed this portal yet but the pieces I have came out nicely. After printing I assemble the parts with gorilla glue. I have provided the keystone_blank.stl file which is blank and you can customize for your own railroad. The stone models used to texture the tunnel portal can be found here: