You need to choose the right side nozzle and adjust the speed settings accordingly, or instruct the printer to use the left nozzle for printing (in your case)
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Thank you! So simple - why hadn’t I thought of checking that?
The cutaway image doesn’t seem to show the filament path being split. The Y-shaped pocket through that [presumably copper] part just increases the surface area to volume ratio, resulting in more through heating of the entire melt, which lowers heating time and thus increases throughput.