Cooling fan 3010 4010 4020 5015 mm With 2Pin Dupont Wire Cooler Wire DC 5V 12V 24V Multiple options 3D Printer raspberry pi

Oil bearing:Low accuracy,Life of 20,000 hours, about 3 years,Bearing and the axis of the relative movement of the line contact, the operation of a larger friction, vacuum extraction method in the bearing diameter surface oil hole storage, the friction generated by the operation of the formation of oil film lubrication, fan vertical way to the fixed use of better.
Single ball bearing:Accuracy of the next, the service life of 30000 hours, about 4 years, the line point of contact are running friction followed by the use of both oil bearing / double ball bearing characteristics, the operating load mainly falls on the front of the ball, and the back Copper is provided by the fulcrum, and according to the role of the ball after the adjustment of the heart.Double ball bearing:The highest precision, the service life of 50000 hours, about 6 years, the relative movement of the bearing and the shaft for the point of contact, movement friction is small, the use of internal bearing ball bearings in the holder positioning with lubricating oil for rotary motion.
3D printer fans do not need to determine the brand, fan (brand) randomly sent