Contactless Rear Bike Light (Eddy Current)

Rear Bicycle Light on Eddy Currents.

Materials:

• 6 x 10x3 mm magnets;
• 450-500 turns of copper coil ~ 0.2 mm diameter;
• 3 (or more) x bright 5 mm red LEDs;
• 1 х reflector from pedal (50x12 mm) or something like that;
• 1 x M5 nut;
• 2 х ball bearings 8x4x3 mm.

Insert the magnets into the rotor with alternating polarity.

The mount on seatstays must be customized on each case individually. I'm using some plastic clamp.

The light turns on at a speed of about 10-11 km/h (28" wheel).

Print Settings

Printer Brand:

Creality

Printer: 

Ender 3

Rafts:

No

Supports: 

Yes

Resolution:

0.2

Infill: 

20%

Filament: eSUN PLA+ Light Brown

Notes:

Only the coil bobbin needs supports. It may be worth cutting the bobbin model into two parts to print easier.