use ; what="*"; vitamins=false; rotate([180,0,0]) the_extruder(what=what, vitamins=vitamins, left=true, pulley_d=12, pulley_elevation=2, teeth_elevation = 7.5, bore_l = 17, mounthole_depth = 10, idler_d = 10, idler_h = 4, idler_id =3, knob_bore_l = 8, spring_lc = 8, knob_bore_d_tolerance=.8 );