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I made one of these and it came out nicely (but haven't printed with it yet). One possible gotcha is that imitation j-heads can have larger aluminum blocks at the bottom (near hotend exit) that stick out more in all directions, to where there's an interference with the hotend corners and the thin inner edge of the fan shroud. The hole for the heater/resistor is noticeably closer to the hotend center on a real j-head, so this interference doesn't occur there.