How does the Auto Leveling work on OverLord?
Auto Leveling is one of the most exciting features of modern 3D printers. Consistently printing high-quality objects requires the build plate to be exactly where the printer thinks it is, automatic bed leveling is the easiest way to calibrate the printer’s build platform. Currently most printers solve this problem by using a “touch probe” which is attached near the extruder nozzle. A sensor is used to detect when the probe is in contact with the build surface.
However, the method OverLord uses is unique: it is 100% software based and no sensor involved. Hard to grasp but actually quite simple. How does it work?
Before printing, the print head goes all the way up to the end switch and then down to the print bed. Although we know the steps for the whole distance we drive it very slow when the nozzle is close to the print bed. In close proximity we drive the print head very slowly down for a set number of steps. This is to make sure the nozzle touches the print bed very gentlely even if it's out of level. That few millimeter are within the set steps for that function and driven with very low force. Once the set number of steps are finished the marker is set to zero. Then the print head is going all the way up till it hits the upper end stop switch and that number of steps is stored to automatic leveling the print head. That action will be repeated for all the points and after that the print can start. That simple it is.
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