Ball bearing is very important for 3D Printer, which make x axis, y axis, z axis move smoothly. Normally ABEC-5 is good enough for 3D Printing. Oil as lubrication inside the bearing also protecting the bearing over spin. U604ZZ Ball Bearing, this is a popular size of Skate bearing or any application Specifications- Item: U604ZZ Ball Bearing- Type: Deep groove ball bearing - Material: Steel - Lubrication: Oil - Closures: 2 Shield, can't be removed and re-installed again - Dimensions: 4mm x 13mm x 4mm/Metric - ID (inner diameter)/Bore: 4mm - OD (outer diameter): 13mm - Width/Height/thickness: 4mm - Size: 4 x 13 x 4 mm
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