Single Track Stone Tunnel Portal for O Scale Model Trains

thingiverse

This is a highly detailed version of my original tunnel portal for O Scale Model trains like Lionel or MTH. The exterior dimensions are based off the MTH single track portal, and internal dimensions have been expanded to give more room for trains when the portals are installed near curves. This design is modular and can be printed on smaller 3D printers like the Davinci Mini. When assembled, the internal dimensions of the portal are: single track width ~4.8 inches, height ~5.75 inches. You can print the base pieces and rear connectors without supports; however, both upper sections and the keystone need to be printed with supports. I recommend using a .2 resolution with 15% infill for best results. I have not fully printed this portal yet, but the parts I have printed so far came out nicely. After printing, assemble the parts with gorilla glue. I have provided the keystone_blank.stl file, which is blank and can be customized for your own railroad. The stone models used to texture the tunnel portal can be found at http://www.thingiverse.com/thing:959682. Print Settings: Printer: Davinci Mini Rafts: Doesn't Matter Supports: Yes Resolution: .2 Infill: 10-20 Notes: Parts needed for a single track portal: 1. bottom_left (repaired).stl 1. bottom_right (repaired).stl 2. connector_small (repaired).stl 1. connector_big (repaired).stl 1. top_left (repaired).stl 1. top_right (repaired).stl 1. keystone_blank.stl