This is the complete collection of all the tunnel portal componets that I have produced for single and double tunnel portals.

These can be used to create a tunnel or a bridge. As this is a modular design you can build your tunnel or bridge to pretty much the required size you need. See individual items for more info on each element.

designed at OO gauge, 1/76.2 scale but can easily be scaled for other gauges.for HO gauge print at 87%, 1/87 Scale,for TT print at 63.5% 1/120 Scale,for O gauge UK at 175%, 1/43.5 Scale,for O gauge International print at 158%, 1/48 Scale,for N gauge print at 51.49%, 1/148 Scale

The examples in the pictures were printed on a Bambu Labs A1 FDM Printer.As normal with my designs, there is a balance between accuracy and printability, hopefully not affecting the look of the model too much.

For FDM printing, I used a 0.4mm nozzle and a layer height of 0.12mm using PLA or PLA+ filament. PETG is also a very good choice. Designed to be printed inverted with no supports.