2019 Motorised Engine

We loved playing with the wooden train tracks. It is like a puzzle with a hundred solutions.

One thing we were missing though was an train engin that could run around by itself.

I could not find any so I made one.

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Parts used:

Motor: DC3V-6V DC Gear T-Motor
Battery: 3.7V lithium polymer 061730 601730 280mAh
Charger: Micro USB 5V 1A 18650 TP4056 Lithium Battery Charger Module With Protection
Switch: MTS-102 3-pin Toggle Switch
LED: 3mm 2-3V White LED
(AliExpress links are examples)

Afterthought: A resistor of around 60ohm in series with the white LED to reduce 3.7V from the battery should have been used.
The value of the resistor might vary a bit, depending on the LED used.

3D files can be downloaded from Thingiverse