Calibration sticks

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You should only calibrate the steps/mm setting for the extruder axis unless you're working with a very large printer (300mm and above) or using a different type of drive like spectra line instead of timing belts. In that case, print a test part at the largest scale that fits on your print bed, oriented in the direction you want to calibrate. Keep in mind that the test parts will be slightly larger than their intended size due to calibration error. Measure the distance between the holes in each end using precision measuring devices like tape measures or calipers. Start from the 100mm mark and move upwards for more accurate results. If you can visually match the hole distance to your measuring device, you're close enough. FFF 3D printers are not known for their precision, so small calibration errors won't significantly impact printer accuracy. Measuring holes instead of outer dimensions ensures that any extruder or axis calibration issues won't affect the final measurement results. You can calculate new steps/mm values using this formula: [old steps per mm] * [nominal distance] / [measured distance] = [new steps per mm] (Video available)