diff --git a/LuaLibs/WProcessLapJoint.lua b/LuaLibs/WProcessLapJoint.lua
index 00e06a7..56db8de 100644
--- a/LuaLibs/WProcessLapJoint.lua
+++ b/LuaLibs/WProcessLapJoint.lua
@@ -2863,7 +2863,7 @@ local function MakeMoreFaces( Proc, nRawId, b3Raw)
       end
       local vtN = EgtSurfTmFacetNormVersor( Proc.Id, nFacInd, GDB_ID.ROOT)
       local _, dH, dV = EgtSurfTmFacetMinAreaRectangle( Proc.Id, nFacInd, GDB_ID.ROOT)
-      local dMaxSlotThicknessForBlade = 25
+      local dMaxSlotThicknessForBlade = 19
       local bIsSmallSlot = ( Proc.Fct == 3 and ( min( dH, dV) < dMaxSlotThicknessForBlade - 10 * GEO.EPS_SMALL) and vtN:getZ() > -0.01)
       -- se di fianco
       if not bPckt and Proc.Fct >= 3 and ( ( vtN:getZ() < WD.NZ_MINA) or bIsSmallSlot) then