Funssor MGN12H Z-Axis Rail Kit for Neptune 3/4 Max

The same Funssor Z-axis conversion, sized for the tall Max machines: a 590–600 mm MGN12H rail running the full column. The taller the gantry, the more roller play costs you — on a Neptune 3 Max or 4 Max a tall part drifts toward the upper layers, with banding and walls leaning off vertical. The kit fixes that, but it isn't a stock part: the axis comes fully apart, and mesh leveling and Z-offset are redone afterwards.

Specifications

• 590–600 mm MGN12H rail with carriage block
• Machined brackets and all hardware included
• Sized for 480 mm Z travel (Neptune 4 Max) and 500 mm (Neptune 3 Max)
• Third-party Funssor mod, not a genuine ELEGOO part

Compatibility: ELEGOO Neptune 3 Max and Neptune 4 Max. Sellers offer both 590 and 600 mm variants — the right length depends on your frame revision, so measure the Z column first. The Neptune 3 Pro and Neptune 4 take a separate, shorter kit that costs about a third of this one.