OS-Railway is a complete system of track, trains and accessories, all designed to be fully 3D-printable. The size is the same as O-scale (32mm track) but printability is prioritized over scale.
Update!! Now gearbox available for 24mm DC-motors! https://www.thingiverse.com/thing:5863393
The author stlcove has offered the item for free, you can now download it.
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