MR623-ZZ Bearings
$9.99
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10-pack of MR623-ZZ / 623-ZZ miniature shielded ball bearings for ERCF and small 3D-printer motion assemblies. Each bearing is the compact 3 mm ID × 10 mm OD × 4 mm width size with metal shields on both sides.
Why use MR623-ZZ here
- Metal shielded: ZZ shields help keep dust and printed-plastic debris out while staying lower-drag than contact rubber seals.
- Correct miniature size: 3 × 10 × 4 mm format, also commonly listed as 623-ZZ, 623ZZ, R1030ZZ, or MR623ZZ.
- ERCF context: the ERCF v2 community repo documents a plain 623ZZ bearing encoder option for builders maintaining or adapting v1.1-style kits.
Specifications
- Quantity: 10 bearings
- Bearing type: miniature radial ball bearing
- Size: 3 mm bore / 10 mm outside diameter / 4 mm width
- Shielding: ZZ, metal shields on both sides
- Interchange/search terms: MR623-ZZ, MR623ZZ, 623-ZZ, 623ZZ, R1030ZZ
Fitment and related parts
Useful for ERCF-style filament feeders, encoder mods, and other small printer mechanisms that call for the 3×10×4 mm shielded 623 size. If your build calls for the smaller 5×8×2.5 mm bearing instead, use MR85-ZZ bearings. For the current DFH ERCF kit, see the Enraged Rabbit Carrot Feeder.
Not for
- MR85 / 685-size bearing locations — those are a different size.
- Wet or dirty environments where a rubber-contact 2RS seal is specifically required.
