Keep in mind that the stock Ender 3 Pro has a PTFE tube in the hot end which should not be exposed to temperatures above 240c due to the foul smell released and could eventually damage the tube.If you get an error message saying otherwise, add M501 to the end of config.g If you followed the configuration guide, automatic loading of the config-override file should be enabled.Save the results by sending M500 so that they are loaded automatically at startup. Next send M303 H1 S210 to start the heater tuning process for the hot end.For the Ender 3 and PLA that would be 75-100% For most accurate results, move the nozzle so it is within 1mm of the bed surface, and set the part cooling fan speed to match normal print fan speeds. Ideally this should be done with no filament loaded. Ensure the test is started with the heaters at room temperature.For full details, see: Tuning the heater temperature control.Heater tuning allows RepRapFirmware to find the ideal parameters for the heater model, allowing for quick heat up times, and stable temperatures, with little overshoot.While this guide uses the example of calibrating an Ender 3, the procedures shown here are the same for any printer during initial calibration. It covers tuning the heaters, bed leveling, calibrating the extruder, and finding the optimal settings for the slicer. This guide covers the initial calibration of a 3D printer to ensure reliable print quality. Please post any queries or comments for improvement on the Duet3D forum. PLEASE NOTE THIS GUIDE IS A WORK IN PROGRESS!
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