{"product_id":"mellow-mr85zz-bearing-5x8x2-5mm-ddg-extruder-ender-3","title":"Mellow MR85ZZ Bearing 5×8×2.5mm – DDG Extruder Ender 3","description":"\n\u003ch2\u003eMellow MR85ZZ Bearings for DDG Extruder – Precision 5×8×2.5mm Replacement\u003c\/h2\u003e\n\u003cp\u003eKeep your 3D printer running smoothly with genuine \u003cstrong\u003eMellow MR85ZZ ball bearings\u003c\/strong\u003e. Designed as a direct-fit replacement for DDG and NF Sunrise extruders on Creality Ender 3 and Ender 3 Pro printers, these precision-ground miniature bearings ensure consistent filament feed, reduced friction, and long-lasting extruder performance.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Highlights\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExact-Fit Dimensions:\u003c\/strong\u003e 5mm bore × 8mm OD × 2.5mm width (MR85ZZ spec) — drop-in compatible with DDG extruder assemblies\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDouble-Shielded (ZZ):\u003c\/strong\u003e Metal shields on both sides keep lubricant in and debris out for extended service life\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecision Ground Races:\u003c\/strong\u003e Low rotational torque for smooth, consistent filament drive with minimal backlash\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Quality Construction:\u003c\/strong\u003e Manufactured to tight tolerances by Mellow, a trusted 3D printer accessories specialist\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Quantity Options:\u003c\/strong\u003e Available in packs of 1 through 10 — stock up for future maintenance or multi-printer setups\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo Assembly Required:\u003c\/strong\u003e Ready to install straight out of the package\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMR85ZZ (10MR85)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 × 8 × 2.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMiniature Deep-Groove Ball Bearing, Double-Shielded\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Extruders\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMellow DDG, NF Sunrise\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Printers\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCreality Ender 3, Ender 3 Pro\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePack Sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 pcs\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\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cp\u003eYour selected quantity (1–10 pcs) of Mellow MR85ZZ double-shielded ball bearings.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/nitrile-work-gloves-anti-slip-full-finger-5-pair\"\u003e5-Pair Nitrile Work Gloves – Anti-Slip Full Finger Safety\u003c\/a\u003e — ideal for handling small precision parts during installation\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/ball-end-hex-screwdriver-bit-magnetic-reduced-shank-steel\"\u003eBall End Hex Screwdriver Bit – Magnetic Reduced Shank Steel\u003c\/a\u003e — perfect for tightening extruder fasteners\u003c\/li\u003e\n  \u003cli\u003e\n\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 — another quality precision tool accessory\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 printers and extruders are the Mellow MR85ZZ bearings compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: These MR85ZZ bearings are specifically designed for the Mellow DDG and NF Sunrise extruders used on Creality Ender 3 and Ender 3 Pro 3D printers. The 5×8×2.5mm dimensions make them a direct drop-in replacement for worn or damaged extruder bearings in these setups.\u003c\/p\u003e\n\u003ch4\u003eQ: What does \"ZZ\" mean in MR85ZZ, and why does it matter?\u003c\/h4\u003e\n\u003cp\u003eA: The \"ZZ\" designation means the bearing features metal shields on both sides of the ball race. These shields retain internal lubrication and prevent dust, filament particles, and debris from contaminating the bearing — resulting in a longer service life and more consistent rotational performance compared to open or single-shielded bearings.\u003c\/p\u003e\n\u003ch4\u003eQ: How many bearings should I order?\u003c\/h4\u003e\n\u003cp\u003eA: A single DDG extruder typically requires one MR85ZZ bearing. However, ordering a multi-pack (5–10 pcs) is a smart choice if you run multiple printers or want spares on hand for future maintenance, since bearings are wear items that benefit from periodic replacement.\u003c\/p\u003e\n\u003ch4\u003eQ: Do these bearings require any special installation tools?\u003c\/h4\u003e\n\u003cp\u003eA: No special tools are required — these bearings arrive ready to install. A standard hex screwdriver or precision driver set is all you need to disassemble and reassemble your DDG extruder. No break-in lubrication is necessary as the bearings come pre-lubricated from the factory.\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 printers and extruders are the Mellow MR85ZZ bearings compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These MR85ZZ bearings are specifically designed for the Mellow DDG and NF Sunrise extruders used on Creality Ender 3 and Ender 3 Pro 3D printers. 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