#K4----------------------------------------------
beziercurve cb 4  2 0 0  20 10 0  20 20 0  2 30 0 
polyline pl 2 30 0  2 0 0
mkedge ed cb
wire ww ed pl
mkplane ww ww
revol rv ww 0 0 0 0 1 0 -180
profile pf o -5 10 5 l 4 c 3 90 l 4 d -1 0 l 7
prism pr pf 0 0 15
bfuse f rv pr
nexplode f f
depouille result f 0 0 1 f_8 5 0 0 20 0 0 1

checkprops result -s 2208.65