First Layer Calibration Pattern [from Prusa MK3/MK3S firmware]

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First layer calibration GCODE for Prusa printers as implemented in Prusa MK3/MK3S firmware (https://github.com/prusa3d/Prusa-Firmware), originally created by Marek Bel. Enclosed GCODE files are generated directly from the firmware source code, so that is exactly what your printer does when you execute First Layer Calibration from the Menu. This pattern draws a meander ending with a small square at the end. Available GCODE files for different filaments include PLA (215°C/60°C), PET (230°C/85°C) and ABS (255°C/100°C). To define your custom temperatures, edit lines 6, 7, 8 and 9 of the gcode file with M104 Sxxx; set hotend temp to xxx, M140 Syyy; set bed temp to yyy, M190 Syyy; wait bed temp, and M109 Sxxx; wait hotend temp. ### Layer Height Issue - Version 3.1 There is an inconsistency in the firmware regarding the first layer calibration pattern because the print head is positioned at 0.15 mm height but the algorithm that calculates extrusion for the rectangle at the end of the pattern calculates with a Z value of 0.20 mm, producing over-extrusion which results in the rectangle's bottom being smoother than in regular prints. Version 3 of calibration files uses the original (wrong) value of 0.20 to calculate extrusion for the rectangle but it is exactly what you currently get in the Prusa firmware. Version 3.1 uses proper Z value of 0.15 mm. ***IMPORTANT NOTE: Do not slice the enclosed STL file which is here just for illustration - use enclosed GCODE files.***