BeltDrivenEnder3 by kevinakasam Black Steel Linear Rails Kit

Black-steel Z-axis linear rail pair for the BeltDrivenEnder3 mod. This kit supplies the two 300 mm MGN12H rails with Z0 preload used when adding linear rails to kevinakasam’s BeltDrivenEnder3-style Ender 3 Z-axis build.

Why use these rails

• Matched pair: two 300 mm MGN12H rail-and-carriage assemblies for the left and right Z sides.
• Z0 preload: light preload for smooth motion where low drag matters more than heavy machine-tool loading.
• Black steel option: a lower-cost alternative to the 440C stainless BeltDrivenEnder3 rail kit.

Specifications

• Quantity: 2 rails, each with MGN12H carriage
• Rail length: 300 mm
• Rail size: MGN12H
• Preload: Z0
• Material / finish: black steel

Fitment

Intended for Ender 3-family BeltDrivenEnder3 builds based on kevinakasam’s open-source mod, which converts the Ender 3 Z axis from a leadscrew to synchronized belts. The official project notes compatibility with Ender 3, Ender 3 V2, and Ender 3 Pro; it is not for Ender 3 S1.

Pairs with

• BeltDrivenEnder3 Kit by kevinakasam for the core conversion hardware.
• Fastener Kit for BeltDrivenEnder3 if you are gathering the project hardware separately.

What this is not

• Not the complete BeltDrivenEnder3 conversion kit — belts, printed parts, fasteners, bearings, rods, and electronics are not included unless separately purchased.
• Not stainless steel. Choose the 440C stainless version if corrosion resistance is the priority; keep black-steel rails clean, lubricated, and dry.