Funssor MGN12H Z-Axis Rail Kit for Neptune 3 Pro & 4
Where to Buy
Description
A Funssor Z-axis conversion: an MGN12H linear rail with its carriage plus machined brackets, replacing the stock V-slot rollers. Rollers flat-spot over time and let the gantry rock — on the print that reads as horizontal banding up the whole height and walls that measure differently at the top and bottom. The rail takes the play out and holds the gantry rigid. It is not a stock part: you strip the axis, check the mounting points, and redo mesh leveling and Z-offset once it's back together.
Specifications
- Steel MGN12H linear rail with carriage block
- Machined motor and gantry brackets, hardware included
- Third-party Funssor mod, not a genuine ELEGOO part
- Requires stripping the Z axis and recalibrating afterwards
Compatibility: ELEGOO Neptune 3 Pro and Neptune 4. The tall Neptune 3 Max and Neptune 4 Max need their own kit with a 590–600 mm rail. Sellers price the identical bundle more than 2× apart — compare what's in the photos before paying for the expensive one.