Build a Sci-Fi Energy Core Lamp With 3D Printing and COB LEDs
Share
If you have ever wanted a glowing reactor straight out of a sci-fi movie sitting on your desk, here is a project that nails the look without asking you to be an electronics wizard. Designer katogab10 has shared a fully 3D-printed Energy Core Lamp that pairs a translucent PLA tube with a strip of COB LEDs to create a smooth, dot-free glow that looks genuinely futuristic.
What is an Energy Core Lamp?
The build is essentially a printed shell wrapped around a thin, even light source. Instead of using regular addressable LEDs (which often show as a row of bright dots), katogab10 uses a COB (chip-on-board) LED strip. COB strips are basically a long line of tiny LEDs covered with a phosphor coating, so the light comes out as one continuous glow. Drop that inside a translucent PLA tube and you get the warm, even reactor effect that makes the lamp work.
The rest of the housing is split into modular printed parts that hide the wiring, hold the electronics, and give the piece a clean, professional shape. It is equally happy as a desk lamp, a piece of ambient room lighting, or a display prop on a shelf. You can grab the printable files from the project page on MakerWorld.
Print settings and tips
The translucent tube is the star of the show, so slow down for that part. A 0.4mm nozzle, 0.2mm layer height, and 4 to 5 perimeters will give you a thicker wall that diffuses the light beautifully and hides the strip behind it. Skip ironing on the outer surface — the small layer texture actually helps spread the light. For the opaque housing pieces, standard PLA at 0.2mm and 15% infill is plenty. Use tree supports only where you really need them so the visible faces stay clean, and orient the tube vertically to keep the seam tidy.
Try it on your printer
This is a forgiving project for almost any beginner-friendly machine. An Ender 3, Bambu A1, or Prusa MK4 will all handle the parts without drama. For filament, reach for a translucent or natural PLA for the glowing tube and any solid color PLA you like for the housing. You can pick up everything you need — translucent PLA, sturdy housing PLA, and a 0.4mm nozzle to keep things crisp — from Flarelab in one go.
Frequently asked questions
Do I need translucent PLA, or will white PLA work?
Translucent or natural PLA gives the cleanest, most even glow because light passes through the wall instead of just bouncing off it. White PLA can work but tends to look flat and washed out, so it is worth grabbing a translucent spool for the tube specifically.
Why use a COB LED strip instead of regular LEDs?
Regular LED strips have visible bright spots between dark gaps, which ruins the reactor effect. COB strips have hundreds of tiny LEDs under a continuous phosphor coating, so the light appears as one smooth line — perfect for a glowing core.
Can I print this on an Ender 3 or other small printer?
Yes. The parts are sized to fit on standard 220x220mm beds like the Ender 3, Bambu A1, or Prusa MK4. Just check the model page for the exact part dimensions before you slice.
Do the printed parts need supports?
The translucent tube prints without supports if you orient it vertically. The housing pieces may need a small amount of tree support depending on orientation — keep supports off the visible outer faces to avoid scarring the finish.
Is this safe to leave running like a normal lamp?
COB LED strips run cool and use very little power, so they are fine for extended use. Make sure your power supply is rated correctly for the strip and that no bare wires touch the printed housing — PLA can soften if it gets hot, though that is unlikely with low-power LEDs.
Inspired by reporting from Adafruit.