SpoolHalo Top-Mounted Spool Holder for Elegoo Neptune 3 Series

Designed for optimal filament feeding and quieter operation, this top-mounted spool holder improves printing reliability — especially with brittle filaments — and provides easy visual access for users. A clean and functional upgrade for the Elegoo Neptune 3 Pro / Plus / Max.

This design allows the spool to spin freely with minimal friction thanks to internal bearings, eliminating squeaky noises and reducing load on the extruder. Positioned directly above the filament feeder, it improves feed angle, reduces drag, and is ideal for delicate or moisture-sensitive materials like PLA, PETG, or PC Blend.

Hardware Requirements:
• 1x M3 brass heat-set insert
• 1x M3 screw (length depends on your insert depth)
• 2x Uses rollers Spool Gear Bearing.stl from this model: LINK

According to the design:
• The square hole in the bearings is 10.3 mm
• The axle itself is 10.1 mm square
• The nut has a 10.2 mm square hole
• The slot in the holders is 11 mm

It's recommended to print the axle and holders with 4 walls, top, and bottom layers for strength.

Highlights:
• Smooth rotation with reduced friction and zero noise
• Filament path is direct and short — less tension and strain
• Excellent for brittle filaments that require a gentle feed
• Keeps the spool close and accessible
• Lower lever-arm torque reduces strain on the frame

Limitations:
• Not compatible with stock filament runout sensor
• Swapping spools is slightly more labor-intensive

Version Log
Version 1.0 – Initial release, stable and functional design

Check out companion models:

日本製。 
Made in Japan 🇯🇵