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Amazon.com: for Desktop 3D Printer Special Bearing 624ZZ 4X13X5mm Mute Ball Bearings 624 for Kossel Mini Prusa i3 Parts (Size : 440C Stainless Steel) : Industrial & Scientific
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20Pcs 5mm Bore V Groove Bearing,625 Roller V Shape Groove Wheel,V Groove Pulley Bearing Accessories for CNC 3D Printer: Amazon.com: Industrial & Scientific