MODU LED Rod Adapter – Creative Light Integration

This custom-designed 3D printed adapter enables the integration of a slim rod-style LED light into the MODU® building system. It is specifically engineered to securely hold a compact cylindrical LED flashlight (e.g., Amazon ASIN: B0D41PSJDC) and connect it seamlessly to standard MODU foam blocks.

Product Description

The adapter consists of three precisely fitted components:

• Main housing – Cylindrical body with external MODU-compatible geometry for secure insertion into MODU foam blocks. Printed in PLA matte.
• Threaded retaining cap – Ensures the LED rod is held firmly in place. Printed in PLA matte.
• Lense element - Translucent front disc for soft, child-friendly light distribution. With dual function for switching on and for diffusing light. Printed in transparent PETG.
• Diffuser insert – Optional for the LED lamp an additional diffusor, this one can be printed in another color to change the light color. I used yellow PLA basic for that.

The internal diameter is tailored to fit slim rod-style LED flashlights, allowing a snug, rattle-free fit while maintaining easy removal for battery replacement.

Key Features

• ✔ Compatible with MODU foam blocks (standard connector dimensions)
• ✔ Designed for slim cylindrical LED rod lights
• ✔ Secure threaded closure system
• ✔ Optional light diffuser for softer illumination
• ✔ Durable 3D-printed construction (PLA / PETG recommended)
• ✔ Easy assembly and disassembly

Intended Use

This adapter allows children and adults to incorporate functional lighting into MODU constructions such as:

• Vehicles
• Play structures
• Tunnels
• Creative installations

It expands the modular play system with an interactive light element while maintaining structural integrity and safety.

Assembly Instructions

1. Place the diffuser disc (optional) at the front opening of the cylindrical LED light (i bought this one https://www.amazon.de/-/en/gp/aw/d/B0D41PSJDC).
2. Insert the LED rod into the main housing.
3. Add the lense into the retaining cap.
4. Screw on the retaining cap to secure the LED.
5. Insert the adapter into a MODU block as you would a standard connector.

Safety Notice

• Use only low-heat, battery-operated LED lights.
• Always ensure the LED device is properly secured before use.
• Not suitable for children under 3 years without supervision (small parts).