Hi The mainboard and print head connection lines do not match. The print head connection lines of the GT2560 V4.0 mainboard and the GT2560 V4.1B mainboard are different and cannot be mixed, GT2560_V4.1B printing head connector cable sku is :37-001-0365, if you have any problems you can contact my mailbox:myorder@geeetech.com, have a nice day.
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