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This is theoretical assumption, but I suppose that your steps/mm values are now wrong in EEPROM - specifically they are set to 0 (zeroed steps per mm)? Could you please use LCD and navigate to Configuration > Advanced Settings > Steps per mm and check what values are set there? If there are zeros, could you set them to positive values (e.g. =80) and ...


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From a comment can be read that the OP found the solution: it's fixed : it's because I didn't level the bed once after flashing the firmware, once it has been done the error is no more


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Annoyingly, this went away with a replacement board. I don't have a better fix.


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For both machines did you compare extruder's (E) steps/mm setting in Marlin and possibly stored in EPROM (so check from the LCD in Configuration>Advanced settings) ? Also stepper motors ... I believe they are exactly of the same type? There are 1.8 degree and 0.9 degree stepper motors on the market - so exactly doubled flow could be related to rotation. ...


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The supplement on how to proceed with custom menus in practice: Enable (uncomment) this line in configuration_adv.h: #define CUSTOM_USER_MENUS Below there are 5 sample entries, later you can change them or remove/comment out. You can add new, for example: #define USER_DESC_6 "Home Z (0.2)" #define USER_GCODE_6 "G28 Z\nG0 Z0.2" #...


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The MKS Base v1.2 is basically an Arduino MEGA2560 and a RAMPS1.4 on a single board. You can use the RAMPS pin designation. Note that the endstop to origin distances is explained in question How to center my prints on the build platform? (Re-calibrate homing offset). In Jims Marlin fork you can find this at: #define X_MIN_POS 0 - XTRA_BED_LEFT and #define ...


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You do a critical error in your order of operations: you home. Then you home again. However, the firmware does not check if the switch is already depressed, it waits for a signal to cut out. But the signal is already not there. And as you will notice, it moves into X+ and Y+ before rehoming into 0, but does not do so in Z. To prevent that behavior, you need ...


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