Why you need a BL-Touch for Auto Bed Leveling?

 Since the function of BL-Touch is to detect and correct the distance between the printer nozzle and printer bed, the BL-Touch device has to be installed near the nozzle, enabling proximity sensor on the BL-Touch device to achieve high precision and high accuracy. Similar to the optical end-stops, the BL-Touch also utilizes the principle of optics. Once the leveling process is triggered, the sensor examines the distance between printer bed and nozzle by probing different specific locations on the printing platform. During this process, the data is collected and transmitted to its firmware, and then calculate whether the print bed is adjusted to its appropriate position on the XY axis.

In a word, the BL-Touch auto-leveling device makes it possible to optimize the distance between the printer nozzle and printer platform via some minor adjustments. The more appropriate the nozzle height is, the better the bed adhesion and print quality are. http://www.3dpinsight.com/archives/208

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