customizable cone-shaped scoop with handlehandle uses a minkowski sum to round all the edges, which is I suspect why the build takes a few minutes. it is way slower in openscad, which is not parallelized and only uses 1/8 cores on my macbook pro. i don't know what the customizer engine uses but it is a bit faster. some code borrowed from user Giles Bathgate-2 on forum.openscad.org: http://forum.openscad.org/Minkowski-sum-slowness-tp929p930.html