Under some circumstances unionRoundMask requires re-flattening of the bottom of the model before slicing.
Consider:
`use <Round-Anything-1.0.4/unionRoundMask.scad>
$fn = 36;
unionRoundMask( r = 1 , detail = $preview ? 3 : 10 , q= $preview ? 30 : 70, showMask = true ) {
cylinder (h=5, r=15);
cylinder (h=10, r=10);
}
translate([40,0,0])
union(){
cylinder (h=5, r=15);
cylinder (h=10, r=10);
}`
Examine the bottoms of both objects. Not a big problem, but does require attention if the fillet in near the base of the object.