Magnetic Light Bar - Prusa Core ONE Added LEDs! Also for L & INDX machines!

Magnetic Light Bar – Prusa Core ONE Added LEDs

Simple, modular LED strip mounts designed specifically for the Prusa Core ONE chassis.

These holders are sized and shaped to nest cleanly into the bent sheet metal geometry of the Core ONE, giving you a solid, intentional-looking way to add internal or accent lighting without zip-tie chaos or adhesive strips floating in space. However they will of course work wherever you want to stick them, not just in a Core ONE.

The design language is intentionally blocky, stealthy, and industrial, matching the Core ONE aesthetic rather than fighting it.

Installing INDX on your Core One and upset by the lack of  lighting? This mod is for YOU! Mount a strip on each side and your chamber lighting will be better than  stock with your new toolchanger printer!

Design Overview

• Magnetic mounting for easy placement and removal

• Sized to fit common LED strip lengths

• Designed around the Core ONE’s sheet metal bends and uprights

• Optional snap-in diffusers for softer, more even light output

• No permanent modification to the printer required

The angled version was designed specifically to illuminate underneath the bed area when the printer is idle. The angle is 13°, which is as steep as possible while remaining reliably support-free and printable. Fits on the upright left of the door between the frame & the Z lead screw.

UPDATED 04/16/2026: 

• Added longer Light Bar (350) and Angled Light Bar (205) for Core One L use.

• Added Magnetic Wire Holder with smaller saddle to hold smaller wires better.

• Updated CAD with these new parts.

Recommended Hardware:

• 8x3 Magnets: https://amzn.to/4sLhvWv

• LED Strips (ones I used): https://amzn.to/4pEXyO9

  • LOW Wattage LEDs recommended if powering off the Prusa Power Supply!

• VHB Tape (to attach LED Strip more securely): https://link.amazon/B0fpqj083

• Prusa Core One: https://mrly.link/coreone

• Prusament Filament: https://mrly.link/prusament

Included Files

• 250 mm LED Holder STL

• 125 mm LED Holder STL

• 125 mm Angled LED Holder (13°)

• 250 mm Diffuser STL

• 125 mm Diffuser STL

• Wire Tie Cable Organizer STL

• CAD files

  • Fusion 360

  • STEP

Note: Lengths refer to the LED strip length that fits inside the holder, not the overall printed part length.

Print Recommendations

• .2mm Layer Height

• 3 Perimeters

• 15+% Infill

• PETG / ABS / ASA Filament (fit tested with ASA)

• NO Supports Required

• Print orientation as supplied.

Core ONE Installation (24v White LEDs):

• Glue magnets into the pockets on the back of the light bar.

• Magnetize in the recess on the top front extrusion (or sides).

• Use Wire Tie cable organizer to route wires down the corner and run along the Y axis rail next to the door sensor cable (left), or the filament sensor cable (right).

• Wire to 24V feed at the Buddy Board.

Notes

• Designed for magnetic mounting to ferrous materials.

• LED strips and wiring are user-supplied.

• Cable management features are integrated to keep wiring clean

• If you use RGB LEDs you should use an external controller & power supply.

• Wiring to the existing White LED strip may be doable but is AT YOUR OWN RISK! I've not tested it.

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