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Building an RC Lego train that cats can ride in with 3D printed rails and wheels. My 2 cats Cookie and Muffin are tired of walking, they’d rather travel by Lego train. Lego isn't designed for building a large train that can carry cats because it lacks large wheels and rails for smooth movement. To solve this, 3D printing was used to create these parts. The rail switches use magnets or rubber for automatic changing. The bogies have a suspension system to handle uneven tracks and curve tilts, with each wheel powered by a strong, compact Lego L motor. The axles are made of aluminium to avoid bending under the weight. The bogies feature an automatic coupling system like those in American trains, which can be opened using air pressure. The train's frame is flexible and only sturdy when combined with the outer shell, it keeps the train low for easy boarding. This frame also contains pipes for door operation and coupling, along with wiring for non-Lego LED lights. The train is powered by 3 Lego Powered Up hubs, allowing for extra sensors to automate the train further. The carriages are designed like trams, the only type suitable for transporting cats, as the cat's weight helps with wheel-rail friction. A standard locomotive would need to be very heavy to pull cat-filled carriages. The train has an open roof for quick cat exits. Programming was done with the Lego Powered Up app, enabling light color changes with direction and control over pneumatic valves through servos. I introduced the cats gradually to the train to make sure they aren’t scared of it. Chapters: 00:00 Sizing 00:50 Wheels 02:37 Coupling 04:25 Frame 05:08 Motors 06:13 Pneumatic 07:06 Lighting 07:57 Shell 09:10 App 09:57 Test Drive 11:23 Introduction Cats 12:28 Cats in Train App for train control: Lego Powered Up Lego Pneumatic parts from

Lego metal axles:

Electric Bricks:

3D Printer:

Modelling Software:

Filament Wheels:

Filament Tracks:

Filament Sleepers:

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