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I really want to print this in fewer pieces I have 300 x 300 x 400 print bed so in theory if cut in half (sideways i.e back of helmet as one piece and front of helmet the other) I think could print this in 2 halves which would be perfect.

However I can't cut it in half in Cura and when I open it in Fusion 360 I also have issues cutting it in half.

Has anyone split it straight down the middle (front and back) and if so can you point me in the the direction of the file?

Many thanks in advance.