This is off the topic of the Gcode app but you guys know more

3D Printing GCodePrintr
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This is off the topic of the Gcode app but you guys know more than me so here is my problem. When I replaced the Y belt I changed the drive gear from the printed part to an aluminum one which is bigger (20t) so my square test print of 30x30mm now prints 30x35mm. What is the commands to recalibrate the Y axis. Thanks

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I don’t use commands to change the calibration. I rather change the DEFAULT_AXIS_STEPS_PER_UNIT variable in the Configuration.h and reflash the firmware.