G4 Bulb Holder - MH001 Replacement

This 3D-printed G4 bulb holder is designed to securely mount a standard G4 bi-pin capsule bulb using just 2 x M3 nuts and 2 x M3 6mm bolts. Whether you're building a custom light fixture or replacing a worn part, this model serves as a direct replacement for the MH001 part commonly found in LED lamp kits — making it a cost-effective and customizable alternative.

Features:

• Direct MH001 Replacement: Designed to match the dimensions and function of the MH001 socket used in popular LED lamp kits.
• Tool-Free Wiring Access: Easy to wire up and mount using common M3 hardware.
• Secure Fit for G4 Bulbs: Firmly holds G4 bi-pin bulbs in place without adhesives.
• Compact, Practical Design: Perfect for space-limited applications and sleek integrations.

Why G4 Bulbs?

G4 bulbs are a go-to option for compact lighting projects because they offer:

• Wide Availability: Readily found online or in most hardware and electronics stores.
• Multiple Options: Available in both halogen and LED formats with a variety of brightness levels and color temperatures.
• Low Voltage Operation: Typically run on 12V, making them ideal for battery-powered or low-voltage DC setups.
• Space-Saving Design: Their small form factor is perfect for tight enclosures, small lamps, and custom lighting solutions.

Perfect For:

• DIY and replacement LED lamp kits
• Custom-designed lamps or lanterns
• Display and shelf lighting
• Props and cosplay builds
• Model lighting or architectural elements
• Compact grow-light setups with G4-compatible LEDs

This holder is a smart upgrade or drop-in replacement for your next lighting project — combining practicality, accessibility, and print-friendly design. If you’ve got a lamp kit with a broken MH001 holder, or you're looking to DIY your own G4-based fixture, this print is a reliable and flexible solution.

Wiring Recommendation:

For best results, this holder is designed to work optimally with 0.75mm² wire (typically stranded copper). This wire size provides a snug fit in the terminals, ensuring a secure electrical connection and minimizing the risk of loose contacts or arcing. Ideal for low-voltage 12V systems, it strikes the right balance between flexibility and current-carrying capacity for most G4 bulb applications.

Assembly

Assembly is relatively easy, insert M3 nuts into the slots as seen in the image below, from the top of the print insert two M3 x 6mm bolts:

Following this insert the wire and the bulb through the two holes in the top and tighten the bolts.

Hope you enjoy :-)