{"product_id":"mellow-nf-oldham-coupling-1204-3d-printer-z-axis-12mm-ball-screw-1","title":"Mellow NF Oldham Coupling 1204 – 3D Printer 12mm Ball Screw","description":"\u003ch2\u003eMellow NF Oldham Coupling 1204 – Z-Axis 12mm Ball Screw Upgrade\u003c\/h2\u003e\n\u003cp\u003eDesigned in collaboration with the VzBoT team, the \u003cstrong\u003eMellow NF Oldham Coupling 1204\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003cp\u003eCNC-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.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrass construction\u003c\/strong\u003e – Low friction, high strength, and excellent surface finish for long service life\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCNC-machined precision\u003c\/strong\u003e – Tight clearance control at all connection points ensures reliable, repeatable performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; low inertia\u003c\/strong\u003e – Small form factor with low moment of inertia for responsive Z-axis movement\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccommodates large radial misalignment\u003c\/strong\u003e – Prevents binding and uneven motion caused by shaft misalignment\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh torsional stiffness\u003c\/strong\u003e – Transfers motion accurately without flex or backlash\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProtects bearings \u0026amp; driven parts\u003c\/strong\u003e – Absorbs misalignment stress so your bearings and motor stay healthy longer\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool-free install \u0026amp; removal\u003c\/strong\u003e – Simple assembly means quick maintenance and easy upgrades\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFor 12mm ball screws\u003c\/strong\u003e – Designed to fit 3D printers using a 12mm ball screw on the Z-axis\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMellow (NF Series)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eItem Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFlexible Shaft Coupler (Oldham Coupling)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Screw\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12mm Ball Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1204 \/ 10VzBoT12OHC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAssembly Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eOldham Coupling × 2 \/ 3 \/ 4 (depending on selected variant)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible With\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAny 3D printer using a 12mm ball screw on the Z-axis (e.g. VzBoT and similar platforms)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products\u003c\/h3\u003e\n\u003cp\u003eYou may also find these useful for your workshop or build projects:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-pack-65mm-oscillating-multi-tool-saw-blades-high-carbon-steel\"\u003e10-Pack 65mm Oscillating Multi-Tool Saw Blades | Carbon Steel\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/ball-end-hex-screwdriver-bit-magnetic-reduced-shank-steel\"\u003eBall End Hex Screwdriver Bit – Magnetic Reduced Shank Steel\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/adjustable-woodworking-compass-layout-gauge-carpenter\"\u003eAdjustable Woodworking Compass Layout Gauge for Carpenters\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is an Oldham coupling and why do I need one for my 3D printer Z-axis?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this Oldham coupling compatible with my 3D printer?\u003c\/h4\u003e\n\u003cp\u003eA: This coupling is specifically designed for 3D printers that use a \u003cstrong\u003e12mm ball screw\u003c\/strong\u003e 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.\u003c\/p\u003e\n\u003ch4\u003eQ: How many couplings are included in the package?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Does this coupling require any special tools to install?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is an Oldham coupling and why do I need one for my 3D printer Z-axis?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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. 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