Piaggio SI – LED Headlight Reflector Replacement

This project replaces the original headlight reflector of the Piaggio SI with a 3D-printed cover designed to hold a standard LED spotlight. It allows you to upgrade the original lighting system while keeping the classic look of the bike.

The part fits inside the original headlight housing and acts as a mounting base for a round LED light (focal/spot type). It is optimized to be printed without supports.

Features

Replaces the original Piaggio SI reflector

Designed for installing a round LED spotlight

Keeps the original external appearance

No support structures required

Easy installation using the original mounting points (or basic screws)

Recommended Print Settings

Layer height: 0.2 mm

Infill: 20–30%

Perimeters: 3

Material: PLA, ABS or PETG

No supports needed

Optional: Brim/Skirt for better adhesion

Assembly Instructions

Remove the original headlight lens from the Piaggio SI.

Take out the original reflector.

Insert the 3D printed cover into the headlight housing.

Install your LED light into the dedicated hole.

Secure it with screws or a tight friction fit (depending on your LED model).

Reinstall the original lens.

Compatible LED size

Designed for round LED spotlight with approx. diameter of: [50mm] (Adjustable in CAD if needed)

Notes

Wiring is not included in this project.

Make sure the LED you use is compatible with your electrical system.

This is a DIY/experimental part – use on public roads only if legal in your country.

If you like this project, please leave a like and a make on Thingiverse. Feel free to share improvements or remixes!

Enjoy and ride safe 🛵💡