Recently, I made some single-track versions of these, and someone commented (hopefully you're doing a double-track version as well). So to keep people happy, I have decided to do double-track versions.

This is the 2nd / 3rd radius track version. I have also done a 3rd / 4th radius version, and will be doing a straight version in the same dimensions.https://www.cgtrader.com/3d-print-models/games-toys/other/model-railway-3rd-and-4th-radius-double-track-curved-bridge-desk

This design comes in two versions: 22.5-degree and 45-degree segments. The 45-degree version is more for people with large printers or printing in smaller scales. The 22.5 degree item will need a printer with a print bed 240mm x 190mm in order to print OO/HO.For OO, I recommend printing with a 0.4mm nozzle, but for smaller scales like N and TT120, I would recommend a 0.2mm nozzle. This design doesn't need any supports to print. I have designed it in such a way that supports aren't needed..

To help lay the track, I have added a couple of guide rails for it to follow, and you may want to glue the track in place (Track width approx. 30mm). I have also included versions without these guide rails.

Sections were designed in 2.25-degree segments so that they can export other sizes in increments of 2.25 degrees if needed.If you have any questions, please feel free to contact me.

This model bridge is for a 2nd/3rd-radius curved track with a 438/505mm radius.

The design has been tested on the Bambu Labs A1 printer with a 0.4mm nozzle. I used ELEGOO PLA+ Filament 1.75mm Grey https://amzn.to/4bU03sx (Affiliate Link)

This item has been designed at OO gauge, 1/76.2 scale.For HO Gauge print at 87%, 1/87 Scale,For O Gauge UK print at 175%, 1/43.5 scale,For O Gauge International print at 158%, 1/48 scale,For TT120 Gauge print at 63.5%, 1/120 scale,For N Gauge UK print at 51.5%, 1/148 Scale, (Caution: I have not test printed this in N gauge scale. will probably need a 0.2mm nozzle to print).

use this link to join CGTrader and download my designs.

https://www.cgtrader.com/designers/PJD1974?referral_id=3218445