N Scale Double Track Brick Tunnel Portal

N Scale Double Track Brick Tunnel Portal This is a detailed N Scale double-track brick tunnel portal designed for modern FDM printers. The portal features raised brick courses, stone arch rings, and decorative stone framing to represent classic masonry tunnel construction used on North American railroads. The design prints cleanly on standard 0.4 mm nozzle printers and looks excellent when printed with a color change to highlight the brickwork. Perfect for adding a realistic tunnel entrance to your N scale layout. Scale N Scale (1:160) Designed for double track mainlines. Printing Recommendations Printer tested on Prusa MK3 series printers, but should print well on any modern FDM printer. Recommended settings: Layer height: 0.10 – 0.20 mm Nozzle: 0.4 mm Infill: 10–15% Supports: Not required Orientation: Print flat on the build plate. Color Change Settings (Optional) For a realistic brick and stone look you can add filament color changes in your slicer. Example color setup: 0 – 3.6 mm → Stone / concrete color 3.7 mm – 4.1 mm top → Brick red 4.2 mm - 5 mm Stone / Concrete color This highlights the brick texture while keeping the stone trim a different color. Features • Double track tunnel portal • Raised brick detail for easy painting • Decorative stone arch rings • Realistic masonry framing • Designed for easy FDM printing • No supports required Painting Tips If printing in one color, dry brushing works great. Suggested method: Print in gray or tan Apply dark wash Dry brush brick red Highlight stone details with light gray This will bring out the mortar lines and brick texture. Designed by Archimage 3D Studios Custom N scale scenery and structures designed for hobbyists who want realistic layout details. More designs coming soon.