Rear Bike Light

Simple, clean, compact DIY alternative to commercial rear lights. I used a short piece of Bambu Lab 5 V 6500K white LED light strip (3 LEDs), but any standard LED strip should work. This light was designed for use with a Bafang motor kit, which provides a 6 V / 500 mA output for lighting. To safely power a 5 V strip, I used two 1N4007 diodes in series to drop the voltage to a ~4,8 V.

The housing is made up of four parts for easy printing, assembly and future modular upgrades:

1. Main light enclosure
2. Mounting base – connects to the light enclosure
3. Mounting adapter – attaches to mounting base and bike
4. Lens cover – Diffuses light and is best printed with red filament

Printing Recommendations:

• Use PETG or ASA for strength, UV, and weather resistance

Assembly Notes:
Assembling this light requires some basic soldering skills and equipment, LED strip, 2-wire cable (max ⌀ 3,5 mm), CA or epoxy glue, 20 mm M3 hex bolt, M3 nut and another M3 bolt + nut or zip ties for attaching the light to your bike. Check attached assembly guide.

April 19, 2025:
First release

Check my other household items here!

Appreciate your feedback and suggestions — happy riding! 🚲