diff --git a/StrategyLibs/BLADETOWASTE.lua b/StrategyLibs/BLADETOWASTE.lua
index ce94957..bd80fb5 100644
--- a/StrategyLibs/BLADETOWASTE.lua
+++ b/StrategyLibs/BLADETOWASTE.lua
@@ -845,8 +845,12 @@ local function CalculateDiceMachinings( vCuts, Parameters)
    local bReduceDiceDepth = Parameters.bReduceDiceDepth
 
    -- trimesh con RestLength
-   local b3CheckCollision = BeamLib.GetPartBoxWithHeadTail( Part, sRestLengthSideForPreSimulation)
-   local idCheckCollisionTm = EgtSurfTmBBox( Part.idTempGroup, b3CheckCollision, false, GDB_RT.GLOB)
+   local idCheckCollisionTm = Part.idBoxTm
+   -- se testa o coda attaccate, si considerano nella superficie di collisione
+   if bCannotSplitRestLength then
+      local b3CheckCollision = BeamLib.GetPartBoxWithHeadTail( Part, sRestLengthSideForPreSimulation)
+      idCheckCollisionTm = EgtSurfTmBBox( Part.idTempGroup, b3CheckCollision, false, GDB_RT.GLOB)
+   end
 
    -- eventuale inversione tagli ortogonali e aggiunta informazioni alla geometria
    local bAreOrthogonalCutsInverted = false