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This hotend design is called a Mk8 type/style hotend, based on the Mk8 Makerbot design. You should get the 40 mm length heatbreak, this option gives you some extra space, a shorter heatbreak will result in changing the Z-endstop height or raise the bed (if the endstop is fixed). The 30 mm will for sure be too short and result in a gap in the heat conducting ...

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