Similar bug using latest FC master: "Unsupported Function: projection" Code to test it out: hull () { linear_extrude (height=1, center=true){ projection (cut = false) { mirror ([1, 0, 0]) { mirror ([0, 1, 0]) { cylinder (h=2, r=20, center=true); } } } } } Error message in console: Linear Extrude Wit...