Mellow NF Oldham Coupling 1204 – 3D Printer 12mm Ball Screw

Mellow NF Oldham Coupling 1204 – Z-Axis 12mm Ball Screw Upgrade

Designed in collaboration with the VzBoT team, the Mellow NF Oldham Coupling 1204 is a precision-machined brass shaft coupler built specifically for 3D printers using a 12mm ball screw on the Z-axis. If you're battling hot-bed wobble, layer inconsistencies, or vibration-induced print artifacts, this coupling is the upgrade your machine needs.

CNC-machined for tight tolerances, this Oldham coupling effectively compensates for radial misalignment between your motor shaft and ball screw, isolating the hot bed from the transmission mechanism and significantly improving print consistency.

Key Features

• Brass construction – Low friction, high strength, and excellent surface finish for long service life
• CNC-machined precision – Tight clearance control at all connection points ensures reliable, repeatable performance
• Compact & low inertia – Small form factor with low moment of inertia for responsive Z-axis movement
• Accommodates large radial misalignment – Prevents binding and uneven motion caused by shaft misalignment
• High torsional stiffness – Transfers motion accurately without flex or backlash
• Protects bearings & driven parts – Absorbs misalignment stress so your bearings and motor stay healthy longer
• Tool-free install & removal – Simple assembly means quick maintenance and easy upgrades
• For 12mm ball screws – Designed to fit 3D printers using a 12mm ball screw on the Z-axis

Specifications

Package Includes

• Oldham Coupling × 2 / 3 / 4 (depending on selected variant)

Compatible With

• Any 3D printer using a 12mm ball screw on the Z-axis (e.g. VzBoT and similar platforms)

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Frequently Asked Questions

Q: What is an Oldham coupling and why do I need one for my 3D printer Z-axis?

A: An Oldham coupling is a type of flexible shaft coupler that connects two shafts while accommodating radial (side-to-side) misalignment. On a 3D printer's Z-axis, even small misalignments between the stepper motor shaft and the ball screw can cause the hot bed to wobble during printing, leading to layer banding and inconsistent print quality. The Mellow NF Oldham Coupling 1204 isolates these forces, keeping your hot bed stable and your prints clean.

Q: Is this Oldham coupling compatible with my 3D printer?

A: This coupling is specifically designed for 3D printers that use a 12mm ball screw on the Z-axis, such as the VzBoT platform and similar builds. If your printer uses a 12mm ball screw, this coupling should be compatible. Always verify your ball screw diameter before purchasing.

Q: How many couplings are included in the package?

A: The package is available in multiple quantity variants — you can choose a set of 2, 3, or 4 Oldham couplings depending on the needs of your printer build. Most dual-Z configurations require 2 couplings.

Q: Does this coupling require any special tools to install?

A: No special tools are required. The Mellow NF Oldham Coupling 1204 is designed for straightforward installation and removal, making it easy to fit into your 3D printer's Z-axis assembly during initial setup or maintenance.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.