Polvorilla Viaduct Model Bridge for HO Scale Trains

Model bridge, HO scale trains, reproduction of the Polvorilla viaduct, of the Tren a las Nubes railway line in Argentina, File STL-OBJ for 3D Printer

Assembly Model

More than 200 hours of modeling

All the files have been decimated by the polygons, but without losing the details, this makes the light files suitable for each computer

dimensions approximately:

• L 94 Cm H 20 Cm W 10 Cm
• L 37 inch H 7,8 inch W 4 inch

all files are already in place for optimal printing

The bridge 3D model was designed to get a clean print result, without considering printing material consumption, However, you are free to rotate, or scale, every part of the model in the most convenient way for you.

Each file has been checked and repaired with Netfabb

The parts of the model are already positioned for 3D printing

Compatible with every Slicer- Simplify3D, Care, Slic3r, etc ...

All the parts of the model have been cut so as to be printed vertically, for a higher quality of printing

The Tren a las Nubes (English: Train to the Clouds) is a tourist train service in Salta Province, Argentina. The service runs along the eastern part of the Salta–Antofagasta railway line of the Belgrano Railway (also known as the "C-14" line) that connects the Argentine Northwest with the border in the Andes mountain range, over 4,220 metres (13,850 ft) above mean sea level, the fifth highest railway in the world. Originally built for economic and social reasons, it is now primarily of interest to tourists as a heritage railway, though cheaper tickets are also available for locals to use the train as transport.

The railway line has 29 bridges, 21 tunnels, 13 viaducts, 2 spirals and 2 zigzags. Because of the design decision not to use a rack-and-pinion for traction, the route had to be designed to avoid steep grades. The zigzags allow the train to climb up driving back and forth parallel to the slope of the mountain.

The train runs four days a week, departing from San Antonio de los Cobres (where passengers arrive from Salta by bus) to La Polvorilla viaduct. Though most tourists simply do the 8-hour one-way trip and return by other means. The train is composed of a dining carriage, bar carriage, a first aid area and two passenger carriages with room for 170 people, though this is expected to increase to 400 over time.

Currently, the train leaves San Antonio station for the 13-hour, 434-kilometre (270 mi) round trip to the Polvorilla viaduct, located 4,220 m (13,850 ft) above sea level. The curved viaduct is 224 m (735 ft) long and 64 m (210 ft) high. Once the train has left Salta, it first enters the Valle de Lerma, and then the Quebrada del Toro, before reaching the puna. There are numerous stops along the way, some with markets selling artisan goods and locals offering regional cuisine.

*Wikipedia*

Generic

Recommended settings for printing:

Each part was cut to be printed vertically, to have a better quality print, so for the upper parts,

it is recommended to print with a 4-5 skirt

Quality:

• Layer height: 0.1mm*
• Initial layer thickness: 0.3mm
• Bottom/top pattern: lines
• Horizontal expansion: 0.04mm (when entering 0.04mm index, the 3D printer perceives the model as monolith, i.e. as having no hidden layers).

*Layer Height 0.1mm is recommended for a better quality for the printed model. However, the printing time will double.

As a STL file provider, our goal is to ensure that the files are error-free and printable in the most accurate way. This is why we only test print the most difficult segments of

the model’s parts.

The model's parts have been tested and printed in PLA. In case you need advice where to get your filaments from, check our partner's website.

Speed setups:

• Infill speed: 30mm/s
• Outer shell speed : 30mm/s
• Inner shell speed: 20mm/s
• Top/bottom speed: 20mm/s
• Support speed: 50mm/s
• Travel speed: 150mm/s
• Skirt speed: 30mm/s
• Amount of slower layers: 4

Infill:

• Infill pattern: Grid
• Line distance: 1.5mm
• Infill overlap: 20%
• Infill layers: 0

Support:

• Enable support: Check
• Placement: Everywhere
• Overhang angle: 30°
• X/Y distance: 0.7mm
• Top distance: 0.2mm
• Bottom distance: 0.2mm
• Stair step height: 0.5mm
• Join distance: 0.7mm
• Area smoothing: 0.6mm
• Use towers: check
• Pattern: Grid
• Line distance: 1.5mm