diff --git a/ChainCurves.cpp b/ChainCurves.cpp
index 280cc27..426ef0d 100644
--- a/ChainCurves.cpp
+++ b/ChainCurves.cpp
@@ -169,7 +169,7 @@ ChainCurves::GetChainFromPoint( const Point3d& ptStart, const Vector3d& vtStart,
       ptCurr = bEquiv ? m_vCrvData[nId].ptEnd : m_vCrvData[nId].ptStart ;
       vtCurr = bEquiv ? m_vCrvData[nId].vtEnd : - m_vCrvData[nId].vtStart ;
      // verifico se sono arrivato al punto di chiusura
-      if ( AreSamePointEpsilon( ptCurr, ptStop, m_dToler)) {
+      if ( AreSamePointEpsilon( ptCurr, ptStop, 0.5 * EPS_SMALL)) {
          bStopped = true ;
          break ;
       }
diff --git a/SurfAux.cpp b/SurfAux.cpp
index e2aa4c4..d234d60 100644
--- a/SurfAux.cpp
+++ b/SurfAux.cpp
@@ -29,6 +29,7 @@
 
 #define SAVEMKUNIF_CRVS 0
 #if SAVEMKUNIF_CRVS
+   std::vector<IGeoObj*> vGeo ;
    #include "/EgtDev/Include/EGkGeoObjSave.h"
 #endif
 
@@ -618,7 +619,7 @@ MakeUniform( ISurfFlatRegion*& pSfr, bool& bRescaled, const DBLVECTOR& vU0, cons
 
 #if SAVEMKUNIF_CRVS
    //debug
-   vector<IGeoObj*> vGeo ;
+   vGeo.clear() ;
    for( int i = 0 ; i < ssize( vLoop); ++i){
       vGeo.push_back(vLoop[i]->Clone()) ;
    }
@@ -654,7 +655,7 @@ MakeUniform( ISurfFlatRegion*& pSfr, bool& bRescaled, const DBLVECTOR& vU0, cons
             for ( int l = 0 ; l < ssize( vLoop); ++l) {
                #if SAVEMKUNIF_CRVS
                   //debug
-                  vector<IGeoObj*> vGeo ;
+                  vGeo.clear() ;
                   vGeo.push_back(pTrimMask->Clone()) ;
                   vGeo.push_back(vLoop[l]->Clone()) ;
                   SaveGeoObj( vGeo, "D:\\Temp\\bezier\\import3dm\\trim_error\\failed_trim_crv_inters.nge") ;
@@ -741,7 +742,7 @@ MakeUniform( ISurfFlatRegion*& pSfr, bool& bRescaled, const DBLVECTOR& vU0, cons
 
             #if SAVEMKUNIF_CRVS
                //debug
-               vector<IGeoObj*> vGeo ;
+               vGeo.clear() ;
                for( int i = 0 ; i < ssize( vCrvStrip); ++i){
                   vGeo.push_back(vCrvStrip[i]->Clone()) ;
                }
@@ -784,7 +785,7 @@ MakeUniform( ISurfFlatRegion*& pSfr, bool& bRescaled, const DBLVECTOR& vU0, cons
 
             #if SAVEMKUNIF_CRVS
                //debug
-               vector<IGeoObj*> vGeo ;
+               vGeo.clear() ;
                for( int i = 0 ; i < ssize( vCrvStrip); ++i){
                   vGeo.push_back(vCrvStrip[i]->Clone()) ;
                }
@@ -797,7 +798,7 @@ MakeUniform( ISurfFlatRegion*& pSfr, bool& bRescaled, const DBLVECTOR& vU0, cons
                if ( ! vUniformedCurves.empty()  ||  ! vCrvStrip.empty()) {
                   #if SAVEMKUNIF_CRVS
                      //debug
-                     vector<IGeoObj*> vGeo ;
+                     vGeo.clear() ;
                      for( int i = 0 ; i < ssize( vUniformedCurves); ++i){
                         vGeo.push_back(vUniformedCurves[i]->Clone()) ;
                      }
@@ -830,6 +831,15 @@ MakeUniform( ISurfFlatRegion*& pSfr, bool& bRescaled, const DBLVECTOR& vU0, cons
                   ICRVCOMPOPOVECTOR vNewCrv ;
                   int nCrvPrec = ssize( vUniformedCurves) ;
                   while ( chainCrv.GetChainFromNear( ORIG, false, vIds)) {
+                     // se ho una solo curva piccola allora la salto
+                     if ( ssize(vIds) == 1) {
+                           double dLen = 0 ; 
+                           int nId = vIds[0] - 1 ;
+                           if ( ( nId < nCrvPrec  &&  vUniformedCurves[nId]->GetLength( dLen) &&  dLen < dChainTol)  || 
+                                ( vCrvStrip[nId - ssize(vUniformedCurves)]->GetLength(dLen) && dLen < dChainTol))
+                              continue ;
+                     }
+
                      vNewCrv.emplace_back( CreateBasicCurveComposite()) ;
                      for ( int nId : vIds) {
                         nId -= 1 ;
@@ -839,6 +849,16 @@ MakeUniform( ISurfFlatRegion*& pSfr, bool& bRescaled, const DBLVECTOR& vU0, cons
                            vNewCrv.back()->AddCurve( Release( vCrvStrip[nId - ssize( vUniformedCurves)]), true, dChainTol) ;
                      }
                   }
+                  #if SAVEMKUNIF_CRVS
+                     //debug
+                     vGeo.clear() ;
+                     for( int i = 0 ; i < ssize( vNewCrv); ++i){
+                        vGeo.push_back(vNewCrv[i]->Clone()) ;
+                     }
+                     SaveGeoObj( vGeo, "D:\\Temp\\bezier\\import3dm\\trim_error\\trim_crv_unif_AFTERchain.nge") ;
+                     //debug
+                  #endif
+
                   // aggiorno le curve 
                   vUniformedCurves.clear() ;
                   vUniformedCurves.swap( vNewCrv)  ;
@@ -871,7 +891,7 @@ MakeUniform( ISurfFlatRegion*& pSfr, bool& bRescaled, const DBLVECTOR& vU0, cons
 
       // controllo che tutte le curve siano chiuse, sennò vuol dire che ho perso qualche pezzo durante le intersezioni
       for ( int i = 0 ; i < ssize( vUniformedCurves); ++i) {
-         if ( ! vUniformedCurves[i]->IsClosed())
+         if ( ! vUniformedCurves[i]->IsClosed()  &&  ! vUniformedCurves[i]->Close())
             return false ;
       }
 
diff --git a/SurfFlatRegionBooleans.cpp b/SurfFlatRegionBooleans.cpp
index cbd5ef9..266538a 100644
--- a/SurfFlatRegionBooleans.cpp
+++ b/SurfFlatRegionBooleans.cpp
@@ -20,6 +20,12 @@
 #include "/EgtDev/Include/EGkIntervals.h"
 #include "/EgtDev/Include/EgtPointerOwner.h"
 
+#define SAVELOOPS 0
+#if SAVELOOPS
+std::vector<IGeoObj*> vGeo ;
+#include "/EgtDev/Include/EGkGeoObjSave.h"
+#endif
+
 using namespace std ;
 
 //----------------------------------------------------------------------------
@@ -172,6 +178,13 @@ SurfFlatRegion::Subtract( const ISurfFlatRegion& Other)
       pSfr.Set( new( nothrow) SurfFlatRegion) ;
    else
       pSfr.Set( MyNewSurfFromLoops( vpLoop)) ;
+
+#if SAVELOOPS
+   for (int i = 0 ; i < ssize( vpLoop) ; ++i)
+      vGeo.push_back( vpLoop[i]) ;
+   SaveGeoObj( vGeo, "D:\\Temp\\inters\\CrvCrvInters\\NewLoops.nge") ;
+#endif
+
    if ( IsNull( pSfr)) {
       MyTestAndDelete( vpCurve) ;
       MyTestAndDelete( vpLoop) ;