Vernier type multi-nozzle XY-offsets calibration print (0.05mm precision)

thingiverse

Hi,\r\nInspired by vernier scales, I crafted this printable scale to measure XY-offsets for multi-nozzle 3D printing. Theoretically, it can measure XY-offsets with 0.05mm precision.\r\n\r\nIn your favorite slicer, position the two scales on the build plate (along X or Y axis). Make sure the zero marks are aligned. Set the main nozzle to print the fixed scale (red one in pic), and the other nozzle to print the test scale (yellow one in pic). Slice the file and print it.\r\n\r\nUsually, just print one layer. Then read the marks to get the offsets in millimeters. \r\n\r\nThe first digit of the offset can be read from the fixed scale, just find the nearest mark on the left side to the zero mark on the fixed scale. The digit under the decimal point can be read from the test scale (white one in pics), just identify which mark on the test scale has the best alignment with the fixed scale mark.\r\n\r\nYou can print two pairs of the model to measure X and Y offsets at the same time. \r\n\r\nThe OpenSCAD file is attached, where you can change precision, unit (e.g., 2mm or 3mm per mark), and font (change the typeface variable setting).\r\n\r\nAny comments or suggestions are appreciated! \r\n\r\nThanks!