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I have looked at the central pin cutoff and I agree with you but I don't know what line of the script in OpenSCAD represents the pin feature, as I am not familiar with this software. The only problem which worries me the most is a trapped powder between all inaccessible gaps which probably won't be properly blown away and this may cause jamming between mating faces. I am considering to model some holes underneath the heart to allow printer operator remove excess of trapped powder.